$HRZN
Horizon Technology Finance Corp Stock $hrzn

$hrzn Overview Financials Valuation SEC Filings Company Website

2024 Q1 Form 10-K Financial Statement

#000143774924005719 Filed on February 27, 2024

Income Statement

Concept	2024 Q1	2023 Q4	2023
Revenue	$12.98M	$2.662M	$62.94M
YoY Change	-1.6%	-83.79%	-1.9%
Cost Of Revenue	$12.72M	$11.77M	$48.70M
YoY Change	-11.68%	1.26%	19.28%
Gross Profit	$9.461M	-$9.109M	-$13.71M
YoY Change	59.41%	-289.81%	-158.77%
Gross Profit Margin	72.87%	-342.19%	-21.78%
Selling, General & Admin	$429.0K	$453.0K	$1.837M
YoY Change	-3.6%	22.1%	25.91%
% of Gross Profit	4.53%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization
YoY Change
% of Gross Profit
Operating Expenses	$429.0K	$453.0K	$1.837M
YoY Change	-3.6%	22.1%	25.91%
Operating Profit	$9.032M	-$9.562M	-$15.54M
YoY Change	64.52%	-315.94%	-171.09%
Interest Expense	$8.161M		$28.97M
YoY Change	14.62%		50.87%
% of Operating Profit	90.36%
Other Income/Expense, Net
YoY Change
Pretax Income	$9.032M	-$9.713M	-$15.70M
YoY Change	64.52%	-319.35%	-171.78%
Income Tax	$379.0K	$948.0K	$1.490M
% Of Pretax Income	4.2%
Net Earnings	$8.653M	-$10.66M	-$17.19M
YoY Change	63.08%	-365.26%	-181.25%
Net Earnings / Revenue	66.64%	-400.49%	-27.3%
Basic Earnings Per Share	$0.38		$1.98
Diluted Earnings Per Share	$0.26	-$0.32	-$0.56
COMMON SHARES
Basic Shares Outstanding	33.40M	33.33M	30.96M
Diluted Shares Outstanding

Balance Sheet

Concept	2024 Q1	2023 Q4	2023
SHORT-TERM ASSETS
Cash & Short-Term Investments	$68.80M	$73.08M	$73.08M
YoY Change	58.01%	164.04%	164.04%
Cash & Equivalents	$71.33M	$75.72M	$26.45M
Short-Term Investments
Other Short-Term Assets
YoY Change
Inventory
Prepaid Expenses
Receivables
Other Receivables
Total Short-Term Assets	$85.38M	$87.01M	$87.01M
YoY Change	48.78%	110.92%	110.92%
LONG-TERM ASSETS
Property, Plant & Equipment
YoY Change
Goodwill
YoY Change
Intangibles
YoY Change
Long-Term Investments	$713.6M	$711.7M	$711.7M
YoY Change	-0.23%	-1.53%	-1.53%
Other Assets
YoY Change
Total Long-Term Assets	$716.9M	$715.4M	$715.4M
YoY Change	-0.55%	-1.41%	-1.41%
TOTAL ASSETS
Total Short-Term Assets	$85.38M	$87.01M	$87.01M
Total Long-Term Assets	$716.9M	$715.4M	$715.4M
Total Assets	$802.3M	$802.4M	$802.4M
YoY Change	3.09%	4.63%	4.63%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable
YoY Change
Accrued Expenses	$3.225M	$4.077M	$4.077M
YoY Change	-8.07%	51.9%	51.9%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due	$50.14M	$47.93M	$47.93M
YoY Change		262.83%	262.83%
Total Short-Term Liabilities	$67.81M	$64.07M	$64.07M
YoY Change	301.02%	132.9%	132.9%
LONG-TERM LIABILITIES
Long-Term Debt	$402.4M	$414.3M	$414.3M
YoY Change	-8.48%	-1.56%	-1.56%
Other Long-Term Liabilities
YoY Change
Total Long-Term Liabilities	$402.4M	$414.3M	$414.3M
YoY Change	-8.48%	-1.56%	-1.56%
TOTAL LIABILITIES
Total Short-Term Liabilities	$67.81M	$64.07M	$64.07M
Total Long-Term Liabilities	$402.4M	$414.3M	$414.3M
Total Liabilities	$470.2M	$478.4M	$478.4M
YoY Change	2.98%	6.69%	6.69%
SHAREHOLDERS EQUITY
Retained Earnings	-$131.5M	-$127.0M
YoY Change	83.45%	88.15%
Common Stock	$37.00K	$36.00K
YoY Change	23.33%	24.14%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$332.1M	$324.0M	$324.0M
YoY Change
Total Liabilities & Shareholders Equity	$802.3M	$802.4M	$802.4M
YoY Change	3.09%	4.63%	4.63%

Cashflow Statement

Concept	2024 Q1	2023 Q4	2023
OPERATING ACTIVITIES
Net Income	$8.653M	-$10.66M	-$17.19M
YoY Change	63.08%	-365.26%	-181.25%
Depreciation, Depletion And Amortization
YoY Change
Cash From Operating Activities	$4.041M	$11.22M	-$5.256M
YoY Change	-68.26%	-113.14%	-97.87%
INVESTING ACTIVITIES
Capital Expenditures
YoY Change
Acquisitions
YoY Change
Other Investing Activities
YoY Change
Cash From Investing Activities
YoY Change
FINANCING ACTIVITIES
Cash Dividend Paid	$10.40M		$40.52M
YoY Change	15.02%		35.77%
Common Stock Issuance & Retirement, Net			$65.09M
YoY Change			-23.06%
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-$8.430M	14.39M	$50.51M
YoY Change	-352.93%	-82.6%	-77.99%
NET CHANGE
Cash From Operating Activities	$4.041M	11.22M	-$5.256M
Cash From Investing Activities
Cash From Financing Activities	-$8.430M	14.39M	$50.51M
Net Change In Cash	-$4.389M	25.61M	$45.26M
YoY Change	-127.32%	-1040.89%	-369.14%
FREE CASH FLOW
Cash From Operating Activities	$4.041M	$11.22M	-$5.256M
Capital Expenditures
Free Cash Flow
YoY Change

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2023	dei	Amendment Flag AmendmentFlag	false
CY2023	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2023	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2023	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2023
CY2023Q4	us-gaap	Investment Owned At Cost InvestmentOwnedAtCost	759182000	usd
CY2022Q4	us-gaap	Investment Owned At Cost InvestmentOwnedAtCost	721248000	usd
CY2023Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		usd
CY2022Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		usd
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CY2023Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	1000000
CY2022Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	1000000
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CY2022Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0
CY2022Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0
CY2023Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.001
CY2022Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.001
CY2023Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	100000000
CY2022Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	100000000
CY2023Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	33534854
CY2022Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	27920838
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CY2022Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	27753373
CY2023Q4	hrzn	Investment Owned Nav Percent InvestmentOwnedNavPercent	2.189	pure
CY2022Q4	hrzn	Investment Owned Nav Percent InvestmentOwnedNavPercent	2.261	pure
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CY2023	hrzn	Investments Nonaccrual Interest Income InvestmentsNonaccrualInterestIncome	0	usd
CY2021	us-gaap	Interest Income Operating Paid In Kind InterestIncomeOperatingPaidInKind	0	usd
CY2022Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	0	usd
CY2023	us-gaap	Open Tax Year OpenTaxYear	2020 2021 2022 2023
CY2023	us-gaap	Stock Repurchased During Period Shares StockRepurchasedDuringPeriodShares	0
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CY2023Q4	us-gaap	Debt Instrument Unamortized Discount Premium And Debt Issuance Costs Net DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet	3765000	usd
CY2022Q4	us-gaap	Debt Instrument Unamortized Discount Premium And Debt Issuance Costs Net DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet	5245000	usd
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CY2023	ecd	Non Rule10b51 Arr Adopted Flag NonRule10b51ArrAdoptedFlag	false
CY2023	dei	Document Type DocumentType	10-K
CY2023	dei	Document Annual Report DocumentAnnualReport	true
CY2023	dei	Document Period End Date DocumentPeriodEndDate	2023-12-31
CY2023	dei	Document Transition Report DocumentTransitionReport	false
CY2023	dei	Entity File Number EntityFileNumber	814-00802
CY2023	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
CY2023	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	27-2114934
CY2023	dei	Entity Address Address Line1 EntityAddressAddressLine1	312 Farmington Avenue
CY2023	dei	Entity Address City Or Town EntityAddressCityOrTown	Farmington
CY2023	dei	Entity Address State Or Province EntityAddressStateOrProvince	CT
CY2023	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	06032
CY2023	dei	City Area Code CityAreaCode	860
CY2023	dei	Local Phone Number LocalPhoneNumber	676‑8654
CY2023	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	No
CY2023	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2023	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2023	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2023	dei	Entity Filer Category EntityFilerCategory	Non-accelerated Filer
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CY2023	dei	Icfr Auditor Attestation Flag IcfrAuditorAttestationFlag	false
CY2023	dei	Document Fin Stmt Error Correction Flag DocumentFinStmtErrorCorrectionFlag	false
CY2023	dei	Entity Shell Company EntityShellCompany	false
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CY2023	dei	Auditor Firm AuditorFirmId	49
CY2023	dei	Auditor Name AuditorName	RSM US LLP
CY2023	dei	Auditor Location AuditorLocation	Hartford, Connecticut
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CY2022Q4	us-gaap	Cash Cash	20612000	usd
CY2023Q4	us-gaap	Money Market Funds At Carrying Value MoneyMarketFundsAtCarryingValue	26450000	usd
CY2022Q4	us-gaap	Money Market Funds At Carrying Value MoneyMarketFundsAtCarryingValue	7066000	usd
CY2023Q4	us-gaap	Restricted Investments RestrictedInvestments	2642000	usd
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CY2023Q4	us-gaap	Incentive Fee Payable IncentiveFeePayable	0	usd
CY2022Q4	us-gaap	Incentive Fee Payable IncentiveFeePayable	1392000	usd
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CY2022Q4	us-gaap	Other Accrued Liabilities Current And Noncurrent OtherAccruedLiabilitiesCurrentAndNoncurrent	2684000	usd
CY2023Q4	us-gaap	Liabilities Liabilities	478375000	usd
CY2022Q4	us-gaap	Liabilities Liabilities	448378000	usd
CY2023Q4	us-gaap	Preferred Stock Value PreferredStockValue	0	usd
CY2022Q4	us-gaap	Preferred Stock Value PreferredStockValue	0	usd
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CY2022Q4	us-gaap	Common Stock Value CommonStockValue	29000	usd
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CY2023	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	1432000	usd
CY2023	us-gaap	Investment Company Dividend Distribution InvestmentCompanyDividendDistribution	43807000	usd
CY2023	hrzn	Reclassification Of Permanent Tax Differences ReclassificationOfPermanentTaxDifferences	0	usd
CY2023Q4	us-gaap	Assets Net AssetsNet	323981000	usd
CY2023	us-gaap	Net Income Loss NetIncomeLoss	-17185000	usd
CY2022	us-gaap	Net Income Loss NetIncomeLoss	21151000	usd
CY2021	us-gaap	Net Income Loss NetIncomeLoss	27782000	usd
CY2023	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	1852000	usd
CY2022	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	1604000	usd
CY2021	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	1091000	usd
CY2023	us-gaap	Gain Loss On Sale Of Investments GainLossOnSaleOfInvestments	-29702000	usd
CY2022	us-gaap	Gain Loss On Sale Of Investments GainLossOnSaleOfInvestments	-9484000	usd
CY2021	us-gaap	Gain Loss On Sale Of Investments GainLossOnSaleOfInvestments	-3248000	usd
CY2023	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-151000	usd
CY2022	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-0	usd
CY2023	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	1900000	usd
CY2022	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	1600000	usd
CY2021	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	1100000	usd
CY2023	hrzn	Adjustments To Additional Paid In Capital Nondeductible Excise Taxes Paid AdjustmentsToAdditionalPaidInCapitalNondeductibleExciseTaxesPaid	1500000	usd
CY2022	hrzn	Adjustments To Additional Paid In Capital Nondeductible Excise Taxes Paid AdjustmentsToAdditionalPaidInCapitalNondeductibleExciseTaxesPaid	700000	usd
CY2021	hrzn	Adjustments To Additional Paid In Capital Nondeductible Excise Taxes Paid AdjustmentsToAdditionalPaidInCapitalNondeductibleExciseTaxesPaid	400000	usd
CY2023Q4	hrzn	Federal Excise Tax Percent FederalExciseTaxPercent	0.04	pure
CY2023	us-gaap	Excise And Sales Taxes ExciseAndSalesTaxes	1500000	usd
CY2022	us-gaap	Excise And Sales Taxes ExciseAndSalesTaxes	700000	usd
CY2021	us-gaap	Excise And Sales Taxes ExciseAndSalesTaxes	400000	usd
CY2023Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	0	usd
CY2022Q4	us-gaap	Investment Owned At Cost InvestmentOwnedAtCost	721248000	usd
CY2021	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-395000	usd
CY2023	us-gaap	Unrealized Gain Loss On Investments UnrealizedGainLossOnInvestments	-48780000	usd
CY2022	us-gaap	Unrealized Gain Loss On Investments UnrealizedGainLossOnInvestments	-5552000	usd
CY2021	us-gaap	Unrealized Gain Loss On Investments UnrealizedGainLossOnInvestments	3205000	usd
CY2023	us-gaap	Payments For Purchase Of Securities Operating Activities PaymentsForPurchaseOfSecuritiesOperatingActivities	218689000	usd
CY2022	us-gaap	Payments For Purchase Of Securities Operating Activities PaymentsForPurchaseOfSecuritiesOperatingActivities	421978000	usd
CY2021	us-gaap	Payments For Purchase Of Securities Operating Activities PaymentsForPurchaseOfSecuritiesOperatingActivities	344445000	usd
CY2023	us-gaap	Proceeds From Maturities Prepayments And Calls Of Securities Operating Activities ProceedsFromMaturitiesPrepaymentsAndCallsOfSecuritiesOperatingActivities	152293000	usd
CY2022	us-gaap	Proceeds From Maturities Prepayments And Calls Of Securities Operating Activities ProceedsFromMaturitiesPrepaymentsAndCallsOfSecuritiesOperatingActivities	95871000	usd
CY2021	us-gaap	Proceeds From Maturities Prepayments And Calls Of Securities Operating Activities ProceedsFromMaturitiesPrepaymentsAndCallsOfSecuritiesOperatingActivities	188010000	usd
CY2023	us-gaap	Interest Income Operating Paid In Kind InterestIncomeOperatingPaidInKind	8433000	usd
CY2022	us-gaap	Interest Income Operating Paid In Kind InterestIncomeOperatingPaidInKind	-0	usd
CY2021	us-gaap	Interest Income Operating Paid In Kind InterestIncomeOperatingPaidInKind	-0	usd
CY2023	us-gaap	Proceeds From Sale Of Securities Operating Activities ProceedsFromSaleOfSecuritiesOperatingActivities	11066000	usd
CY2022	us-gaap	Proceeds From Sale Of Securities Operating Activities ProceedsFromSaleOfSecuritiesOperatingActivities	49964000	usd
CY2021	us-gaap	Proceeds From Sale Of Securities Operating Activities ProceedsFromSaleOfSecuritiesOperatingActivities	52954000	usd
CY2023	hrzn	Equity Received In Settlement Of Fee Income EquityReceivedInSettlementOfFeeIncome	-89000	usd
CY2022	hrzn	Equity Received In Settlement Of Fee Income EquityReceivedInSettlementOfFeeIncome	0	usd
CY2021	hrzn	Equity Received In Settlement Of Fee Income EquityReceivedInSettlementOfFeeIncome	0	usd
CY2023	hrzn	Warrants Received In Settlement Of Fee Income WarrantsReceivedInSettlementOfFeeIncome	-80000	usd
CY2022	hrzn	Warrants Received In Settlement Of Fee Income WarrantsReceivedInSettlementOfFeeIncome	0	usd
CY2021	hrzn	Warrants Received In Settlement Of Fee Income WarrantsReceivedInSettlementOfFeeIncome	0	usd
CY2023	us-gaap	Increase Decrease In Accrued Interest Receivable Net IncreaseDecreaseInAccruedInterestReceivableNet	-1773000	usd
CY2022	us-gaap	Increase Decrease In Accrued Interest Receivable Net IncreaseDecreaseInAccruedInterestReceivableNet	3417000	usd
CY2021	us-gaap	Increase Decrease In Accrued Interest Receivable Net IncreaseDecreaseInAccruedInterestReceivableNet	173000	usd
CY2023	hrzn	Increase Decrease In Endofterm Payments IncreaseDecreaseInEndoftermPayments	2035000	usd
CY2022	hrzn	Increase Decrease In Endofterm Payments IncreaseDecreaseInEndoftermPayments	4452000	usd
CY2021	hrzn	Increase Decrease In Endofterm Payments IncreaseDecreaseInEndoftermPayments	1652000	usd
CY2023	hrzn	Increase Decrease In Unearned Income IncreaseDecreaseInUnearnedIncome	3700000	usd
CY2022	hrzn	Increase Decrease In Unearned Income IncreaseDecreaseInUnearnedIncome	394000	usd
CY2021	hrzn	Increase Decrease In Unearned Income IncreaseDecreaseInUnearnedIncome	1295000	usd
CY2023	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	650000	usd
CY2022	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	156000	usd
CY2021	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	394000	usd
CY2023	us-gaap	Increase Decrease In Other Accrued Liabilities IncreaseDecreaseInOtherAccruedLiabilities	1393000	usd
CY2022	us-gaap	Increase Decrease In Other Accrued Liabilities IncreaseDecreaseInOtherAccruedLiabilities	758000	usd
CY2021	us-gaap	Increase Decrease In Other Accrued Liabilities IncreaseDecreaseInOtherAccruedLiabilities	509000	usd
CY2023	us-gaap	Increase Decrease In Management Fee Payable IncreaseDecreaseInManagementFeePayable	-13000	usd
CY2022	us-gaap	Increase Decrease In Management Fee Payable IncreaseDecreaseInManagementFeePayable	359000	usd
CY2021	us-gaap	Increase Decrease In Management Fee Payable IncreaseDecreaseInManagementFeePayable	143000	usd
CY2023	us-gaap	Increase Decrease In Incentive Fee Payable IncreaseDecreaseInIncentiveFeePayable	-1392000	usd
CY2022	us-gaap	Increase Decrease In Incentive Fee Payable IncreaseDecreaseInIncentiveFeePayable	-623000	usd
CY2021	us-gaap	Increase Decrease In Incentive Fee Payable IncreaseDecreaseInIncentiveFeePayable	1040000	usd
CY2023	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	-5256000	usd
CY2022	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	-246277000	usd
CY2021	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	-75992000	usd
CY2023	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	65093000	usd
CY2022	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	84603000	usd
CY2021	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	30086000	usd
CY2023	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	104250000	usd
CY2022	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	199000000	usd
CY2021	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	127000000	usd
CY2023	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	35000000	usd
CY2022	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	149500000	usd
CY2021	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	45000000	usd
CY2023	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	735000	usd
CY2022	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	4364000	usd
CY2021	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	2645000	usd
CY2023	us-gaap	Payments Of Dividends PaymentsOfDividends	40523000	usd
CY2022	us-gaap	Payments Of Dividends PaymentsOfDividends	29847000	usd
CY2021	us-gaap	Payments Of Dividends PaymentsOfDividends	24551000	usd
CY2023	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	50512000	usd
CY2022	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	229462000	usd
CY2021	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	75515000	usd
CY2023	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	45256000	usd
CY2022	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-16815000	usd
CY2021	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-477000	usd
CY2022Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	30466000	usd
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	47281000	usd
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	47758000	usd
CY2023Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	75722000	usd
CY2022Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	30466000	usd
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	47281000	usd
CY2023	us-gaap	Interest Paid Net InterestPaidNet	26880000	usd
CY2022	us-gaap	Interest Paid Net InterestPaidNet	17028000	usd
CY2021	us-gaap	Interest Paid Net InterestPaidNet	10706000	usd
CY2023	hrzn	Refinanced Debt Investment Balances RefinancedDebtInvestmentBalances	32500000	usd
CY2022	hrzn	Refinanced Debt Investment Balances RefinancedDebtInvestmentBalances	30625000	usd
CY2021	hrzn	Refinanced Debt Investment Balances RefinancedDebtInvestmentBalances	0	usd
CY2023	hrzn	Warrant Investments Received And Recorded As Unearned Income WarrantInvestmentsReceivedAndRecordedAsUnearnedIncome	2683000	usd
CY2022	hrzn	Warrant Investments Received And Recorded As Unearned Income WarrantInvestmentsReceivedAndRecordedAsUnearnedIncome	5616000	usd
CY2021	hrzn	Warrant Investments Received And Recorded As Unearned Income WarrantInvestmentsReceivedAndRecordedAsUnearnedIncome	3355000	usd
CY2023Q4	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	11011000	usd
CY2022Q4	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	9159000	usd
CY2021Q4	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	6365000	usd
CY2023	hrzn	Endofterm Payments Receivable Noncash Transaction EndoftermPaymentsReceivableNoncashTransaction	11816000	usd
CY2022	hrzn	Endofterm Payments Receivable Noncash Transaction EndoftermPaymentsReceivableNoncashTransaction	9690000	usd
CY2021	hrzn	Endofterm Payments Receivable Noncash Transaction EndoftermPaymentsReceivableNoncashTransaction	5238000	usd
CY2023	us-gaap	Other Significant Noncash Transaction Value Of Consideration Received1 OtherSignificantNoncashTransactionValueOfConsiderationReceived1	17123000	usd
CY2022	us-gaap	Other Significant Noncash Transaction Value Of Consideration Received1 OtherSignificantNoncashTransactionValueOfConsiderationReceived1	6314000	usd
CY2021	us-gaap	Other Significant Noncash Transaction Value Of Consideration Received1 OtherSignificantNoncashTransactionValueOfConsiderationReceived1	4580000	usd
CY2023Q4	us-gaap	Cash Cash	46630000	usd
CY2022Q4	us-gaap	Cash Cash	20612000	usd
CY2021Q4	us-gaap	Cash Cash	38054000	usd
CY2023Q4	us-gaap	Money Market Funds At Carrying Value MoneyMarketFundsAtCarryingValue	26450000	usd
CY2022Q4	us-gaap	Money Market Funds At Carrying Value MoneyMarketFundsAtCarryingValue	7066000	usd
CY2021Q4	us-gaap	Money Market Funds At Carrying Value MoneyMarketFundsAtCarryingValue	7868000	usd
CY2023Q4	us-gaap	Restricted Cash Equivalents RestrictedCashEquivalents	2642000	usd
CY2022Q4	us-gaap	Restricted Cash Equivalents RestrictedCashEquivalents	2788000	usd
CY2021Q4	us-gaap	Restricted Cash Equivalents RestrictedCashEquivalents	1359000	usd
CY2023Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	75722000	usd
CY2022Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	30466000	usd
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	47281000	usd
CY2023Q4	us-gaap	Investment Owned At Cost InvestmentOwnedAtCost	759182000	usd
CY2023Q4	us-gaap	Investment Owned At Fair Value InvestmentOwnedAtFairValue	709085000	usd
CY2023Q4	hrzn	Percentage Of Nonqualifying Assets On A Cost Basis PercentageOfNonqualifyingAssetsOnACostBasis	0.047	pure
CY2023Q4	hrzn	Percentage Of Nonqualifying Assets On A Fair Value Basis PercentageOfNonqualifyingAssetsOnAFairValueBasis	0.027	pure
CY2022Q4	us-gaap	Investment Owned At Cost InvestmentOwnedAtCost	721248000	usd
CY2022Q4	us-gaap	Investment Owned At Fair Value InvestmentOwnedAtFairValue	720026000	usd
CY2022Q4	hrzn	Percentage Of Nonqualifying Assets On A Cost Basis PercentageOfNonqualifyingAssetsOnACostBasis	0.065	pure
CY2022Q4	hrzn	Percentage Of Nonqualifying Assets On A Fair Value Basis PercentageOfNonqualifyingAssetsOnAFairValueBasis	0.066	pure
CY2022	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	1600000	usd
CY2021	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	1100000	usd
CY2023	hrzn	Adjustments To Additional Paid In Capital Nondeductible Excise Taxes Paid AdjustmentsToAdditionalPaidInCapitalNondeductibleExciseTaxesPaid	1500000	usd
CY2022	hrzn	Adjustments To Additional Paid In Capital Nondeductible Excise Taxes Paid AdjustmentsToAdditionalPaidInCapitalNondeductibleExciseTaxesPaid	700000	usd
CY2023	us-gaap	Use Of Estimates UseOfEstimates	<p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt 0pt 0pt 8pt;"><b><i>Use of estimates</i></b></p> <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"> </p> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:justify;margin:0pt;text-indent:18pt;">In preparing the consolidated financial statements in accordance with GAAP, management is required to make estimates and assumptions that affect the reported amounts of assets and liabilities, and disclosures of contingent assets and liabilities, as of the date of the balance sheet and income and expenses for the period. Actual results could differ from those estimates. Material estimates that are particularly susceptible to significant change in the near term relate to the valuation of investments.</p> <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"> </p>
CY2021	hrzn	Investments Nonaccrual Interest Income InvestmentsNonaccrualInterestIncome	1300000	usd
CY2023	hrzn	Investment Income Attributable To Noncash Paidinkind Interest Percent InvestmentIncomeAttributableToNoncashPaidinkindInterestPercent	0.074	pure
CY2022	us-gaap	Interest Income Operating Paid In Kind InterestIncomeOperatingPaidInKind	0	usd
CY2023	hrzn	Investment Nonaccrual Income Not Received In Cash Percent InvestmentNonaccrualIncomeNotReceivedInCashPercent	0.042	pure
CY2022	hrzn	Investment Nonaccrual Income Not Received In Cash Percent InvestmentNonaccrualIncomeNotReceivedInCashPercent	0.074	pure
CY2021	hrzn	Investment Nonaccrual Income Not Received In Cash Percent InvestmentNonaccrualIncomeNotReceivedInCashPercent	0.059	pure
CY2023Q4	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	5800000	usd
CY2022Q4	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	7100000	usd
CY2023Q4	hrzn	Deferred Finance Costs Accumulated Amortization DeferredFinanceCostsAccumulatedAmortization	6900000	usd
CY2022Q4	hrzn	Deferred Finance Costs Accumulated Amortization DeferredFinanceCostsAccumulatedAmortization	4800000	usd
CY2023	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	1900000	usd
CY2021	hrzn	Adjustments To Additional Paid In Capital Nondeductible Excise Taxes Paid AdjustmentsToAdditionalPaidInCapitalNondeductibleExciseTaxesPaid	400000	usd
CY2023Q4	hrzn	Federal Excise Tax Percent FederalExciseTaxPercent	0.04	pure
CY2023	us-gaap	Excise And Sales Taxes ExciseAndSalesTaxes	1500000	usd
CY2022	us-gaap	Excise And Sales Taxes ExciseAndSalesTaxes	700000	usd
CY2021	us-gaap	Excise And Sales Taxes ExciseAndSalesTaxes	400000	usd
CY2023Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	0	usd
CY2023Q2	us-gaap	Stock Repurchase Program Remaining Authorized Repurchase Amount1 StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1	5000000	usd
	us-gaap	Stock Repurchased During Period Shares StockRepurchasedDuringPeriodShares	167465
	hrzn	Stock Repurchased During Period Per Share StockRepurchasedDuringPeriodPerShare	11.22
	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	1900000	usd
CY2023Q4	us-gaap	Investment Owned At Cost InvestmentOwnedAtCost	759182000	usd
CY2023Q4	us-gaap	Investment Owned At Fair Value InvestmentOwnedAtFairValue	709085000	usd
CY2022Q4	us-gaap	Investment Owned At Cost InvestmentOwnedAtCost	721248000	usd
CY2022Q4	us-gaap	Investment Owned At Fair Value InvestmentOwnedAtFairValue	720026000	usd
CY2023Q4	us-gaap	Investment Owned At Cost InvestmentOwnedAtCost	759182000	usd
CY2023Q4	us-gaap	Investment Owned At Fair Value InvestmentOwnedAtFairValue	709085000	usd
CY2023Q2	us-gaap	Stock Repurchase Program Remaining Authorized Repurchase Amount1 StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1	5000000	usd
	us-gaap	Stock Repurchased During Period Shares StockRepurchasedDuringPeriodShares	167465
	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	1900000	usd
CY2023Q4	us-gaap	Investment Owned At Cost InvestmentOwnedAtCost	759182000	usd
CY2023Q4	us-gaap	Investment Owned At Fair Value InvestmentOwnedAtFairValue	709085000	usd
CY2022Q4	us-gaap	Investment Owned At Cost InvestmentOwnedAtCost	721248000	usd
CY2022Q4	us-gaap	Investment Owned At Fair Value InvestmentOwnedAtFairValue	720026000	usd
CY2023Q4	us-gaap	Investment Owned At Cost InvestmentOwnedAtCost	759182000	usd
CY2023Q4	us-gaap	Investment Owned At Fair Value InvestmentOwnedAtFairValue	709085000	usd
CY2022Q4	us-gaap	Investment Owned At Cost InvestmentOwnedAtCost	721248000	usd
CY2022Q4	us-gaap	Investment Owned At Fair Value InvestmentOwnedAtFairValue	720026000	usd
CY2022Q4	us-gaap	Investment Owned At Fair Value InvestmentOwnedAtFairValue	720026000	usd
CY2022Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	716319000	usd
CY2023	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Purchases FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases	218689000	usd
CY2023	hrzn	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Warrants And Equity Received FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetWarrantsAndEquityReceived	2852000	usd
CY2023	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements	152293000	usd
CY2023	hrzn	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Payment Inkind Interest FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPaymentInkindInterest	8433000	usd
CY2023	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Sales FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales	11066000	usd
CY2023	hrzn	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Realized Gain Loss Included In Earnings FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetRealizedGainLossIncludedInEarnings	-28264000	usd
CY2023	hrzn	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Appreciation Depreciation Included In Earnings FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetAppreciationDepreciationIncludedInEarnings	-44148000	usd
CY2023	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Net FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet	-5111000	usd
CY2023	hrzn	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Between Investments FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersBetweenInvestments	0	usd
CY2023	hrzn	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Other Period Increase Decrease FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetOtherPeriodIncreaseDecrease	1447000	usd
CY2023Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	706858000	usd
CY2021Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	457557000	usd
CY2022	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Purchases FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases	421978000	usd
CY2022	hrzn	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Warrants And Equity Received FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetWarrantsAndEquityReceived	5672000	usd
CY2022	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements	-95871000	usd
CY2022	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Sales FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales	-49835000	usd
CY2022	hrzn	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Realized Gain Loss Included In Earnings FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetRealizedGainLossIncludedInEarnings	-9094000	usd
CY2022	hrzn	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Appreciation Depreciation Included In Earnings FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetAppreciationDepreciationIncludedInEarnings	-6880000	usd
CY2022	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Net FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet	-1371000	usd
CY2022	hrzn	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Between Investments FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersBetweenInvestments	0	usd
CY2022	hrzn	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Other Period Increase Decrease FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetOtherPeriodIncreaseDecrease	-5837000	usd
CY2022Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	716319000	usd
CY2023Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	466000000	usd
CY2023Q4	hrzn	Debt Instrument Asset Coverage Per Unit DebtInstrumentAssetCoveragePerUnit	1695
CY2023Q4	us-gaap	Debt Instrument Convertible Liquidation Preference Per Share DebtInstrumentConvertibleLiquidationPreferencePerShare	0
CY2022Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	439323000	usd
CY2022Q4	hrzn	Debt Instrument Asset Coverage Per Unit DebtInstrumentAssetCoveragePerUnit	1725
CY2022Q4	us-gaap	Debt Instrument Convertible Liquidation Preference Per Share DebtInstrumentConvertibleLiquidationPreferencePerShare	0
CY2021Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	260250000	usd
CY2021Q4	hrzn	Debt Instrument Asset Coverage Per Unit DebtInstrumentAssetCoveragePerUnit	1943
CY2022Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	716319000	usd
CY2023	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Purchases FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases	218689000	usd
CY2023	hrzn	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Warrants And Equity Received FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetWarrantsAndEquityReceived	2852000	usd
CY2023	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements	152293000	usd
CY2023	hrzn	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Payment Inkind Interest FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPaymentInkindInterest	8433000	usd
CY2023	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Sales FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales	11066000	usd
CY2023	hrzn	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Realized Gain Loss Included In Earnings FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetRealizedGainLossIncludedInEarnings	-28264000	usd
CY2023	hrzn	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Appreciation Depreciation Included In Earnings FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetAppreciationDepreciationIncludedInEarnings	-44148000	usd
CY2023	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Net FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet	-5111000	usd
CY2023	hrzn	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Between Investments FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersBetweenInvestments	0	usd
CY2023	hrzn	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Other Period Increase Decrease FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetOtherPeriodIncreaseDecrease	1447000	usd
CY2023Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	706858000	usd
CY2021Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	457557000	usd
CY2022	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Purchases FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases	421978000	usd
CY2022	hrzn	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Warrants And Equity Received FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetWarrantsAndEquityReceived	5672000	usd
CY2022	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements	-95871000	usd
CY2022	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Sales FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales	-49835000	usd
CY2022	hrzn	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Realized Gain Loss Included In Earnings FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetRealizedGainLossIncludedInEarnings	-9094000	usd
CY2022	hrzn	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Appreciation Depreciation Included In Earnings FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetAppreciationDepreciationIncludedInEarnings	-6880000	usd
CY2022	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Net FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet	-1371000	usd
CY2022	hrzn	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Between Investments FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersBetweenInvestments	0	usd
CY2022	hrzn	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Other Period Increase Decrease FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetOtherPeriodIncreaseDecrease	-5837000	usd
CY2022Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	716319000	usd
CY2023Q4	us-gaap	Debt Instrument Face Amount DebtInstrumentFaceAmount	615000000	usd
CY2023Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	466000000	usd
CY2023Q4	us-gaap	Debt Instrument Unused Borrowing Capacity Amount DebtInstrumentUnusedBorrowingCapacityAmount	149000000	usd
CY2022Q4	us-gaap	Debt Instrument Face Amount DebtInstrumentFaceAmount	582573000	usd
CY2022Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	439323000	usd
CY2022Q4	us-gaap	Debt Instrument Unused Borrowing Capacity Amount DebtInstrumentUnusedBorrowingCapacityAmount	143250000	usd
CY2023Q4	us-gaap	Debt Instrument Face Amount DebtInstrumentFaceAmount	615000000	usd
CY2023Q4	us-gaap	Long Term Debt LongTermDebt	462235000	usd
CY2023Q4	us-gaap	Debt Instrument Unused Borrowing Capacity Amount DebtInstrumentUnusedBorrowingCapacityAmount	149000000	usd
CY2022Q4	us-gaap	Debt Instrument Face Amount DebtInstrumentFaceAmount	582573000	usd
CY2022Q4	us-gaap	Long Term Debt LongTermDebt	434078000	usd
CY2022Q4	us-gaap	Debt Instrument Unused Borrowing Capacity Amount DebtInstrumentUnusedBorrowingCapacityAmount	143250000	usd
CY2021Q4	us-gaap	Debt Instrument Convertible Liquidation Preference Per Share DebtInstrumentConvertibleLiquidationPreferencePerShare	0
CY2020Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	187625000	usd
CY2020Q4	hrzn	Debt Instrument Asset Coverage Per Unit DebtInstrumentAssetCoveragePerUnit	2133
CY2020Q4	us-gaap	Debt Instrument Convertible Liquidation Preference Per Share DebtInstrumentConvertibleLiquidationPreferencePerShare	0
CY2023Q4	us-gaap	Debt Instrument Face Amount DebtInstrumentFaceAmount	615000000	usd
CY2023Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	466000000	usd
CY2023Q4	us-gaap	Debt Instrument Unused Borrowing Capacity Amount DebtInstrumentUnusedBorrowingCapacityAmount	149000000	usd
CY2022Q4	us-gaap	Debt Instrument Face Amount DebtInstrumentFaceAmount	582573000	usd
CY2022Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	439323000	usd
CY2023Q4	us-gaap	Debt Instrument Face Amount DebtInstrumentFaceAmount	615000000	usd
CY2022Q4	us-gaap	Debt Instrument Face Amount DebtInstrumentFaceAmount	582573000	usd
CY2022Q4	us-gaap	Long Term Debt LongTermDebt	434078000	usd
CY2022Q4	us-gaap	Debt Instrument Unused Borrowing Capacity Amount DebtInstrumentUnusedBorrowingCapacityAmount	143250000	usd
CY2023Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	466000000	usd
CY2023Q4	hrzn	Debt Instrument Asset Coverage Per Unit DebtInstrumentAssetCoveragePerUnit	1695
CY2023Q4	us-gaap	Debt Instrument Convertible Liquidation Preference Per Share DebtInstrumentConvertibleLiquidationPreferencePerShare	0
CY2022Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	439323000	usd
CY2022Q4	hrzn	Debt Instrument Asset Coverage Per Unit DebtInstrumentAssetCoveragePerUnit	1725
CY2022Q4	us-gaap	Debt Instrument Convertible Liquidation Preference Per Share DebtInstrumentConvertibleLiquidationPreferencePerShare	0
CY2021Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	260250000	usd
CY2021Q4	hrzn	Debt Instrument Asset Coverage Per Unit DebtInstrumentAssetCoveragePerUnit	1943
CY2021Q4	us-gaap	Debt Instrument Convertible Liquidation Preference Per Share DebtInstrumentConvertibleLiquidationPreferencePerShare	0
CY2020Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	187625000	usd
CY2020Q4	hrzn	Debt Instrument Asset Coverage Per Unit DebtInstrumentAssetCoveragePerUnit	2133
CY2020Q4	us-gaap	Debt Instrument Convertible Liquidation Preference Per Share DebtInstrumentConvertibleLiquidationPreferencePerShare	0
CY2019Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	154375000	usd
CY2019Q4	hrzn	Debt Instrument Asset Coverage Per Unit DebtInstrumentAssetCoveragePerUnit	2192
CY2019Q4	us-gaap	Debt Instrument Convertible Liquidation Preference Per Share DebtInstrumentConvertibleLiquidationPreferencePerShare	0
CY2018Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	127875000	usd
CY2018Q4	hrzn	Debt Instrument Asset Coverage Per Unit DebtInstrumentAssetCoveragePerUnit	2050
CY2018Q4	us-gaap	Debt Instrument Convertible Liquidation Preference Per Share DebtInstrumentConvertibleLiquidationPreferencePerShare	0
CY2017Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	95375000	usd
CY2017Q4	hrzn	Debt Instrument Asset Coverage Per Unit DebtInstrumentAssetCoveragePerUnit	2416
CY2017Q4	us-gaap	Debt Instrument Convertible Liquidation Preference Per Share DebtInstrumentConvertibleLiquidationPreferencePerShare	0
CY2016Q4	hrzn	Debt Instrument Asset Coverage Per Unit DebtInstrumentAssetCoveragePerUnit	2450
CY2016Q4	us-gaap	Debt Instrument Convertible Liquidation Preference Per Share DebtInstrumentConvertibleLiquidationPreferencePerShare	0
CY2015Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	115546000	usd
CY2015Q4	hrzn	Debt Instrument Asset Coverage Per Unit DebtInstrumentAssetCoveragePerUnit	2383
CY2015Q4	us-gaap	Debt Instrument Convertible Liquidation Preference Per Share DebtInstrumentConvertibleLiquidationPreferencePerShare	0
CY2014Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	81753000	usd
CY2014Q4	hrzn	Debt Instrument Asset Coverage Per Unit DebtInstrumentAssetCoveragePerUnit	2691
CY2014Q4	us-gaap	Debt Instrument Convertible Liquidation Preference Per Share DebtInstrumentConvertibleLiquidationPreferencePerShare	0
CY2021Q4	hrzn	Investment Company Distributable Earnings Loss Accumulated Depreciation InvestmentCompanyDistributableEarningsLossAccumulatedDepreciation	8738000	usd
CY2023Q4	hrzn	Investment Company Distributable Earnings Loss Accumulated Other Temporary Differences InvestmentCompanyDistributableEarningsLossAccumulatedOtherTemporaryDifferences	12547000	usd
CY2019Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	154375000	usd
CY2019Q4	hrzn	Debt Instrument Asset Coverage Per Unit DebtInstrumentAssetCoveragePerUnit	2192
CY2019Q4	us-gaap	Debt Instrument Convertible Liquidation Preference Per Share DebtInstrumentConvertibleLiquidationPreferencePerShare	0
CY2018Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	127875000	usd
CY2018Q4	hrzn	Debt Instrument Asset Coverage Per Unit DebtInstrumentAssetCoveragePerUnit	2050
CY2018Q4	us-gaap	Debt Instrument Convertible Liquidation Preference Per Share DebtInstrumentConvertibleLiquidationPreferencePerShare	0
CY2017Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	95375000	usd
CY2017Q4	hrzn	Debt Instrument Asset Coverage Per Unit DebtInstrumentAssetCoveragePerUnit	2416
CY2017Q4	us-gaap	Debt Instrument Convertible Liquidation Preference Per Share DebtInstrumentConvertibleLiquidationPreferencePerShare	0
CY2016Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	96000000	usd
CY2016Q4	hrzn	Debt Instrument Asset Coverage Per Unit DebtInstrumentAssetCoveragePerUnit	2450
CY2016Q4	us-gaap	Debt Instrument Convertible Liquidation Preference Per Share DebtInstrumentConvertibleLiquidationPreferencePerShare	0
CY2015Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	115546000	usd
CY2015Q4	us-gaap	Debt Instrument Convertible Liquidation Preference Per Share DebtInstrumentConvertibleLiquidationPreferencePerShare	0
CY2014Q4	hrzn	Debt Instrument Asset Coverage Per Unit DebtInstrumentAssetCoveragePerUnit	2691
CY2014Q4	us-gaap	Debt Instrument Convertible Liquidation Preference Per Share DebtInstrumentConvertibleLiquidationPreferencePerShare	0
CY2023	us-gaap	Net Income Loss NetIncomeLoss	-17185000	usd
CY2022	us-gaap	Net Income Loss NetIncomeLoss	21151000	usd
CY2023	us-gaap	Unrealized Gain Loss On Investments UnrealizedGainLossOnInvestments	-48780000	usd
CY2022	us-gaap	Unrealized Gain Loss On Investments UnrealizedGainLossOnInvestments	-5552000	usd
CY2021	us-gaap	Unrealized Gain Loss On Investments UnrealizedGainLossOnInvestments	3205000	usd
CY2023	hrzn	Other Booktax Differences OtherBooktaxDifferences	931000	usd
CY2021	hrzn	Other Booktax Differences OtherBooktaxDifferences	1462000	usd
CY2023	hrzn	Capital Loss Carryforward Increase Decrease CapitalLossCarryforwardIncreaseDecrease	29853000	usd
CY2023	hrzn	Taxable Income Before Deductions For Distributions TaxableIncomeBeforeDeductionsForDistributions	62379000	usd
CY2022	hrzn	Taxable Income Before Deductions For Distributions TaxableIncomeBeforeDeductionsForDistributions	39479000	usd
CY2021	hrzn	Taxable Income Before Deductions For Distributions TaxableIncomeBeforeDeductionsForDistributions	29682000	usd
CY2023	hrzn	Investment Company Dividend Distribution Paid InvestmentCompanyDividendDistributionPaid	42576000	usd
CY2022	hrzn	Investment Company Dividend Distribution Paid InvestmentCompanyDividendDistributionPaid	31490000	usd
CY2021	hrzn	Investment Company Dividend Distribution Paid InvestmentCompanyDividendDistributionPaid	25099000	usd
CY2023	hrzn	Investment Company Total Distribution InvestmentCompanyTotalDistribution	42576000	usd
CY2022	hrzn	Investment Company Total Distribution InvestmentCompanyTotalDistribution	31490000	usd
CY2021	hrzn	Investment Company Total Distribution InvestmentCompanyTotalDistribution	25099000	usd
CY2022Q4	hrzn	Investment Company Distributable Earnings Loss Accumulated Other Temporary Differences InvestmentCompanyDistributableEarningsLossAccumulatedOtherTemporaryDifferences	11875000	usd
CY2021Q4	hrzn	Investment Company Distributable Earnings Loss Accumulated Other Temporary Differences InvestmentCompanyDistributableEarningsLossAccumulatedOtherTemporaryDifferences	7465000	usd
CY2023Q4	hrzn	Investment Company Retained Earnings Accumulated Deficit InvestmentCompanyRetainedEarningsAccumulatedDeficit	-101842000	usd
CY2022Q4	hrzn	Investment Company Retained Earnings Accumulated Deficit InvestmentCompanyRetainedEarningsAccumulatedDeficit	-43596000	usd
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CY2023Q4	hrzn	Federal Excise Tax Percent FederalExciseTaxPercent	0.04	pure
CY2023Q4	us-gaap	Operating Loss Carryforwards OperatingLossCarryforwards	38600000	usd
CY2023Q4	us-gaap	Sales And Excise Tax Payable Current And Noncurrent SalesAndExciseTaxPayableCurrentAndNoncurrent	1500000	usd
CY2023	us-gaap	Net Income Loss NetIncomeLoss	-17185000	usd
CY2022	us-gaap	Net Income Loss NetIncomeLoss	21151000	usd
CY2021	us-gaap	Net Income Loss NetIncomeLoss	27782000	usd
CY2023	us-gaap	Unrealized Gain Loss On Investments UnrealizedGainLossOnInvestments	-48780000	usd
CY2022	us-gaap	Unrealized Gain Loss On Investments UnrealizedGainLossOnInvestments	-5552000	usd
CY2021	us-gaap	Unrealized Gain Loss On Investments UnrealizedGainLossOnInvestments	3205000	usd
CY2023	hrzn	Other Booktax Differences OtherBooktaxDifferences	931000	usd
CY2022	hrzn	Other Booktax Differences OtherBooktaxDifferences	3292000	usd
CY2021	hrzn	Other Booktax Differences OtherBooktaxDifferences	1462000	usd
CY2023	hrzn	Capital Loss Carryforward Increase Decrease CapitalLossCarryforwardIncreaseDecrease	29853000	usd
CY2022	hrzn	Capital Loss Carryforward Increase Decrease CapitalLossCarryforwardIncreaseDecrease	9484000	usd
CY2021	hrzn	Capital Loss Carryforward Increase Decrease CapitalLossCarryforwardIncreaseDecrease	3643000	usd
CY2023	hrzn	Taxable Income Before Deductions For Distributions TaxableIncomeBeforeDeductionsForDistributions	62379000	usd
CY2021	hrzn	Taxable Income Before Deductions For Distributions TaxableIncomeBeforeDeductionsForDistributions	29682000	usd
CY2023	hrzn	Investment Company Dividend Distribution Paid InvestmentCompanyDividendDistributionPaid	42576000	usd
CY2022	hrzn	Investment Company Dividend Distribution Paid InvestmentCompanyDividendDistributionPaid	31490000	usd
CY2021	hrzn	Investment Company Dividend Distribution Paid InvestmentCompanyDividendDistributionPaid	25099000	usd
CY2023	hrzn	Investment Company Total Distribution InvestmentCompanyTotalDistribution	42576000	usd
CY2022	hrzn	Investment Company Total Distribution InvestmentCompanyTotalDistribution	31490000	usd
CY2021	hrzn	Investment Company Total Distribution InvestmentCompanyTotalDistribution	25099000	usd
CY2022Q4	us-gaap	Investment Company Distributable Earnings Loss Accumulated Ordinary Income Loss InvestmentCompanyDistributableEarningsLossAccumulatedOrdinaryIncomeLoss	18813000	usd
CY2023Q4	us-gaap	Investment Company Distributable Earnings Loss Accumulated Capital Loss Carryforward InvestmentCompanyDistributableEarningsLossAccumulatedCapitalLossCarryforward	102908000	usd
CY2022Q4	us-gaap	Investment Company Distributable Earnings Loss Accumulated Capital Loss Carryforward InvestmentCompanyDistributableEarningsLossAccumulatedCapitalLossCarryforward	73055000	usd
CY2021Q4	us-gaap	Investment Company Distributable Earnings Loss Accumulated Capital Loss Carryforward InvestmentCompanyDistributableEarningsLossAccumulatedCapitalLossCarryforward	63571000	usd
CY2023Q4	hrzn	Investment Company Distributable Earnings Loss Accumulated Appreciation InvestmentCompanyDistributableEarningsLossAccumulatedAppreciation	14935000	usd
CY2022Q4	hrzn	Investment Company Distributable Earnings Loss Accumulated Appreciation InvestmentCompanyDistributableEarningsLossAccumulatedAppreciation	18542000	usd
CY2021Q4	hrzn	Investment Company Distributable Earnings Loss Accumulated Appreciation InvestmentCompanyDistributableEarningsLossAccumulatedAppreciation	12973000	usd
CY2023Q4	hrzn	Investment Company Distributable Earnings Loss Accumulated Depreciation InvestmentCompanyDistributableEarningsLossAccumulatedDepreciation	65032000	usd
CY2022Q4	hrzn	Investment Company Distributable Earnings Loss Accumulated Depreciation InvestmentCompanyDistributableEarningsLossAccumulatedDepreciation	19771000	usd
CY2023Q4	us-gaap	Investment Company Distributable Earnings Loss Accumulated Ordinary Income Loss InvestmentCompanyDistributableEarningsLossAccumulatedOrdinaryIncomeLoss	38616000	usd
CY2022Q4	us-gaap	Investment Company Distributable Earnings Loss Accumulated Ordinary Income Loss InvestmentCompanyDistributableEarningsLossAccumulatedOrdinaryIncomeLoss	18813000	usd
CY2021Q4	us-gaap	Investment Company Distributable Earnings Loss Accumulated Ordinary Income Loss InvestmentCompanyDistributableEarningsLossAccumulatedOrdinaryIncomeLoss	10825000	usd
CY2023Q4	us-gaap	Investment Company Distributable Earnings Loss Accumulated Capital Loss Carryforward InvestmentCompanyDistributableEarningsLossAccumulatedCapitalLossCarryforward	102908000	usd
CY2022Q4	us-gaap	Investment Company Distributable Earnings Loss Accumulated Capital Loss Carryforward InvestmentCompanyDistributableEarningsLossAccumulatedCapitalLossCarryforward	73055000	usd
CY2023Q4	hrzn	Investment Company Distributable Earnings Loss Accumulated Appreciation InvestmentCompanyDistributableEarningsLossAccumulatedAppreciation	14935000	usd
CY2023Q4	hrzn	Investment Company Distributable Earnings Loss Accumulated Depreciation InvestmentCompanyDistributableEarningsLossAccumulatedDepreciation	65032000	usd
CY2022Q4	hrzn	Investment Company Distributable Earnings Loss Accumulated Depreciation InvestmentCompanyDistributableEarningsLossAccumulatedDepreciation	19771000	usd
CY2021Q4	hrzn	Investment Company Distributable Earnings Loss Accumulated Depreciation InvestmentCompanyDistributableEarningsLossAccumulatedDepreciation	8738000	usd
CY2023Q4	hrzn	Investment Company Distributable Earnings Loss Accumulated Other Temporary Differences InvestmentCompanyDistributableEarningsLossAccumulatedOtherTemporaryDifferences	12547000	usd
CY2022Q4	hrzn	Investment Company Distributable Earnings Loss Accumulated Other Temporary Differences InvestmentCompanyDistributableEarningsLossAccumulatedOtherTemporaryDifferences	11875000	usd
CY2021Q4	hrzn	Investment Company Distributable Earnings Loss Accumulated Other Temporary Differences InvestmentCompanyDistributableEarningsLossAccumulatedOtherTemporaryDifferences	7465000	usd
CY2023Q4	hrzn	Investment Company Retained Earnings Accumulated Deficit InvestmentCompanyRetainedEarningsAccumulatedDeficit	-101842000	usd
CY2021Q4	hrzn	Investment Company Retained Earnings Accumulated Deficit InvestmentCompanyRetainedEarningsAccumulatedDeficit	-41046000	usd
CY2023Q4	hrzn	Federal Excise Tax Percent FederalExciseTaxPercent	0.04	pure
CY2023Q4	us-gaap	Operating Loss Carryforwards OperatingLossCarryforwards	38600000	usd
CY2022Q4	us-gaap	Operating Loss Carryforwards OperatingLossCarryforwards	18800000	usd
CY2023Q4	us-gaap	Sales And Excise Tax Payable Current And Noncurrent SalesAndExciseTaxPayableCurrentAndNoncurrent	1500000	usd
CY2022Q4	us-gaap	Sales And Excise Tax Payable Current And Noncurrent SalesAndExciseTaxPayableCurrentAndNoncurrent	700000	usd
CY2023Q4	us-gaap	Tax Basis Of Investments Cost For Income Tax Purposes TaxBasisOfInvestmentsCostForIncomeTaxPurposes	759200000	usd
CY2022Q4	us-gaap	Tax Basis Of Investments Cost For Income Tax Purposes TaxBasisOfInvestmentsCostForIncomeTaxPurposes	721200000	usd
CY2023Q4	us-gaap	Tax Basis Of Investments Gross Unrealized Appreciation TaxBasisOfInvestmentsGrossUnrealizedAppreciation	14900000	usd
CY2022Q4	us-gaap	Tax Basis Of Investments Gross Unrealized Appreciation TaxBasisOfInvestmentsGrossUnrealizedAppreciation	18500000	usd
CY2023Q4	us-gaap	Tax Basis Of Investments Gross Unrealized Depreciation TaxBasisOfInvestmentsGrossUnrealizedDepreciation	65000000	usd
CY2022Q4	us-gaap	Tax Basis Of Investments Gross Unrealized Depreciation TaxBasisOfInvestmentsGrossUnrealizedDepreciation	19800000	usd
CY2023Q4	us-gaap	Fair Value Disclosure Offbalance Sheet Risks Face Amount Liability FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability	180500000	usd
CY2023Q4	us-gaap	Fair Value Disclosure Offbalance Sheet Risks Amount Liability FairValueDisclosureOffbalanceSheetRisksAmountLiability	2033000	usd
CY2022Q4	us-gaap	Fair Value Disclosure Offbalance Sheet Risks Face Amount Liability FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability	190000000	usd
CY2022Q4	us-gaap	Fair Value Disclosure Offbalance Sheet Risks Amount Liability FairValueDisclosureOffbalanceSheetRisksAmountLiability	1761000	usd
CY2023Q4	us-gaap	Fair Value Disclosure Offbalance Sheet Risks Amount Liability FairValueDisclosureOffbalanceSheetRisksAmountLiability	2000000	usd
CY2022Q4	us-gaap	Fair Value Disclosure Offbalance Sheet Risks Amount Liability FairValueDisclosureOffbalanceSheetRisksAmountLiability	1800000	usd
CY2022Q4	us-gaap	Sales And Excise Tax Payable Current And Noncurrent SalesAndExciseTaxPayableCurrentAndNoncurrent	700000	usd
CY2023Q4	us-gaap	Tax Basis Of Investments Cost For Income Tax Purposes TaxBasisOfInvestmentsCostForIncomeTaxPurposes	759200000	usd
CY2022Q4	us-gaap	Tax Basis Of Investments Cost For Income Tax Purposes TaxBasisOfInvestmentsCostForIncomeTaxPurposes	721200000	usd
CY2023Q4	us-gaap	Tax Basis Of Investments Gross Unrealized Appreciation TaxBasisOfInvestmentsGrossUnrealizedAppreciation	14900000	usd
CY2022Q4	us-gaap	Tax Basis Of Investments Gross Unrealized Appreciation TaxBasisOfInvestmentsGrossUnrealizedAppreciation	18500000	usd
CY2023Q4	us-gaap	Tax Basis Of Investments Gross Unrealized Depreciation TaxBasisOfInvestmentsGrossUnrealizedDepreciation	65000000	usd
CY2022Q4	us-gaap	Tax Basis Of Investments Gross Unrealized Depreciation TaxBasisOfInvestmentsGrossUnrealizedDepreciation	19800000	usd
CY2023Q4	us-gaap	Fair Value Disclosure Offbalance Sheet Risks Face Amount Liability FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability	180500000	usd
CY2023Q4	us-gaap	Fair Value Disclosure Offbalance Sheet Risks Amount Liability FairValueDisclosureOffbalanceSheetRisksAmountLiability	2033000	usd
CY2022Q4	us-gaap	Fair Value Disclosure Offbalance Sheet Risks Face Amount Liability FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability	190000000	usd
CY2022Q4	us-gaap	Fair Value Disclosure Offbalance Sheet Risks Amount Liability FairValueDisclosureOffbalanceSheetRisksAmountLiability	1761000	usd
CY2023Q4	us-gaap	Fair Value Disclosure Offbalance Sheet Risks Amount Liability FairValueDisclosureOffbalanceSheetRisksAmountLiability	2000000	usd
CY2022Q4	us-gaap	Fair Value Disclosure Offbalance Sheet Risks Amount Liability FairValueDisclosureOffbalanceSheetRisksAmountLiability	1800000	usd
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.37
	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	38418000	usd
	us-gaap	Common Stock Dividends Shares CommonStockDividendsShares	127486
	us-gaap	Dividends Common Stock Stock DividendsCommonStockStock	1623000	usd
CY2022	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	32659000	usd
CY2022	us-gaap	Common Stock Dividends Shares CommonStockDividendsShares	61859
CY2022	us-gaap	Dividends Common Stock Stock DividendsCommonStockStock	754000	usd
CY2023	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	1.37
CY2023Q4	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.11
CY2023	hrzn	Taxable Earnings Per Share Basic TaxableEarningsPerShareBasic	2.01
CY2023	us-gaap	Earnings Per Share Basic Undistributed EarningsPerShareBasicUndistributed	1.25
CY2022Q4	us-gaap	Net Asset Value Per Share NetAssetValuePerShare	11.47
CY2021Q4	us-gaap	Net Asset Value Per Share NetAssetValuePerShare	11.56
CY2020Q4	us-gaap	Net Asset Value Per Share NetAssetValuePerShare	11.02
CY2019Q4	us-gaap	Net Asset Value Per Share NetAssetValuePerShare	11.83
CY2018Q4	us-gaap	Net Asset Value Per Share NetAssetValuePerShare	11.64
CY2023	us-gaap	Investment Company Investment Income Loss Per Share InvestmentCompanyInvestmentIncomeLossPerShare	1.98
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.37
	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	38418000	usd
	us-gaap	Common Stock Dividends Shares CommonStockDividendsShares	127486
	us-gaap	Dividends Common Stock Stock DividendsCommonStockStock	1623000	usd
CY2022	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.28
CY2022	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	32659000	usd
CY2022	us-gaap	Common Stock Dividends Shares CommonStockDividendsShares	61859
CY2023	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	1.37
CY2023Q4	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.11
CY2023	hrzn	Taxable Earnings Per Share Basic TaxableEarningsPerShareBasic	2.01
CY2023	us-gaap	Earnings Per Share Basic Undistributed EarningsPerShareBasicUndistributed	1.25
CY2022Q4	us-gaap	Net Asset Value Per Share NetAssetValuePerShare	11.47
CY2021Q4	us-gaap	Net Asset Value Per Share NetAssetValuePerShare	11.56
CY2020Q4	us-gaap	Net Asset Value Per Share NetAssetValuePerShare	11.02
CY2019Q4	us-gaap	Net Asset Value Per Share NetAssetValuePerShare	11.83
CY2018Q4	us-gaap	Net Asset Value Per Share NetAssetValuePerShare	11.64
CY2023	us-gaap	Investment Company Investment Income Loss Per Share InvestmentCompanyInvestmentIncomeLossPerShare	1.98
CY2022	us-gaap	Investment Company Investment Income Loss Per Share InvestmentCompanyInvestmentIncomeLossPerShare	1.46
CY2021	us-gaap	Investment Company Investment Income Loss Per Share InvestmentCompanyInvestmentIncomeLossPerShare	1.41
CY2020	us-gaap	Investment Company Investment Income Loss Per Share InvestmentCompanyInvestmentIncomeLossPerShare	1.18
CY2019	us-gaap	Investment Company Investment Income Loss Per Share InvestmentCompanyInvestmentIncomeLossPerShare	1.52
CY2023	us-gaap	Investment Company Gain Loss On Investment Per Share InvestmentCompanyGainLossOnInvestmentPerShare	-0.97
CY2022	us-gaap	Investment Company Gain Loss On Investment Per Share InvestmentCompanyGainLossOnInvestmentPerShare	-0.38
CY2020	us-gaap	Investment Company Gain Loss On Investment Per Share InvestmentCompanyGainLossOnInvestmentPerShare	-0.84
CY2023	hrzn	Investment Company Investment Depreciation Appreciation Per Share InvestmentCompanyInvestmentDepreciationAppreciationPerShare	-1.57
CY2022	hrzn	Investment Company Investment Depreciation Appreciation Per Share InvestmentCompanyInvestmentDepreciationAppreciationPerShare	-0.22
CY2021	hrzn	Investment Company Investment Depreciation Appreciation Per Share InvestmentCompanyInvestmentDepreciationAppreciationPerShare	0.16
CY2020	hrzn	Investment Company Investment Depreciation Appreciation Per Share InvestmentCompanyInvestmentDepreciationAppreciationPerShare	0.02
CY2019	hrzn	Investment Company Investment Depreciation Appreciation Per Share InvestmentCompanyInvestmentDepreciationAppreciationPerShare	0.24
CY2022	us-gaap	Investment Company Net Asset Value Per Share Period Increase Decrease InvestmentCompanyNetAssetValuePerSharePeriodIncreaseDecrease	0.86
CY2021	us-gaap	Investment Company Net Asset Value Per Share Period Increase Decrease InvestmentCompanyNetAssetValuePerSharePeriodIncreaseDecrease	1.39
CY2023	us-gaap	Investment Company Distribution To Shareholders Per Share InvestmentCompanyDistributionToShareholdersPerShare	1.37
CY2022	us-gaap	Investment Company Distribution To Shareholders Per Share InvestmentCompanyDistributionToShareholdersPerShare	1.28
CY2021	us-gaap	Investment Company Distribution To Shareholders Per Share InvestmentCompanyDistributionToShareholdersPerShare	1.25
CY2020	us-gaap	Investment Company Distribution To Shareholders Per Share InvestmentCompanyDistributionToShareholdersPerShare	1.25
CY2019	us-gaap	Investment Company Distribution To Shareholders Per Share InvestmentCompanyDistributionToShareholdersPerShare	1.2
CY2023	hrzn	Investment Company Distribution To Shareholders Per Share Net Investment Income InvestmentCompanyDistributionToShareholdersPerShareNetInvestmentIncome	-1.37
CY2022	hrzn	Investment Company Distribution To Shareholders Per Share Net Investment Income InvestmentCompanyDistributionToShareholdersPerShareNetInvestmentIncome	-1.28
CY2020	hrzn	Investment Company Distribution To Shareholders Per Share Net Investment Income InvestmentCompanyDistributionToShareholdersPerShareNetInvestmentIncome	-1.25
CY2022Q4	hrzn	Investment Company Distribution To Shareholders Per Share Net Realized Gain On Investments InvestmentCompanyDistributionToShareholdersPerShareNetRealizedGainOnInvestments	0
CY2019Q4	hrzn	Investment Company Distribution To Shareholders Per Share Net Realized Gain On Investments InvestmentCompanyDistributionToShareholdersPerShareNetRealizedGainOnInvestments	0
CY2023	us-gaap	Investment Company Tax Return Of Capital Distribution Per Share InvestmentCompanyTaxReturnOfCapitalDistributionPerShare	0
CY2022	us-gaap	Investment Company Tax Return Of Capital Distribution Per Share InvestmentCompanyTaxReturnOfCapitalDistributionPerShare	0
CY2022	us-gaap	Investment Company Investment Income Loss Per Share InvestmentCompanyInvestmentIncomeLossPerShare	1.46
CY2021	us-gaap	Investment Company Investment Income Loss Per Share InvestmentCompanyInvestmentIncomeLossPerShare	1.41
CY2020	us-gaap	Investment Company Investment Income Loss Per Share InvestmentCompanyInvestmentIncomeLossPerShare	1.18
CY2019	us-gaap	Investment Company Investment Income Loss Per Share InvestmentCompanyInvestmentIncomeLossPerShare	1.52
CY2023	us-gaap	Investment Company Gain Loss On Investment Per Share InvestmentCompanyGainLossOnInvestmentPerShare	-0.97
CY2022	us-gaap	Investment Company Gain Loss On Investment Per Share InvestmentCompanyGainLossOnInvestmentPerShare	-0.38
CY2021	us-gaap	Investment Company Gain Loss On Investment Per Share InvestmentCompanyGainLossOnInvestmentPerShare	-0.18
CY2020	us-gaap	Investment Company Gain Loss On Investment Per Share InvestmentCompanyGainLossOnInvestmentPerShare	-0.84
CY2019	us-gaap	Investment Company Gain Loss On Investment Per Share InvestmentCompanyGainLossOnInvestmentPerShare	-0.31
CY2023	hrzn	Investment Company Investment Depreciation Appreciation Per Share InvestmentCompanyInvestmentDepreciationAppreciationPerShare	-1.57
CY2022	hrzn	Investment Company Investment Depreciation Appreciation Per Share InvestmentCompanyInvestmentDepreciationAppreciationPerShare	-0.22
CY2021	hrzn	Investment Company Investment Depreciation Appreciation Per Share InvestmentCompanyInvestmentDepreciationAppreciationPerShare	0.16
CY2020	hrzn	Investment Company Investment Depreciation Appreciation Per Share InvestmentCompanyInvestmentDepreciationAppreciationPerShare	0.02
CY2019	hrzn	Investment Company Investment Depreciation Appreciation Per Share InvestmentCompanyInvestmentDepreciationAppreciationPerShare	0.24
CY2023	us-gaap	Investment Company Net Asset Value Per Share Period Increase Decrease InvestmentCompanyNetAssetValuePerSharePeriodIncreaseDecrease	-0.56
CY2022	us-gaap	Investment Company Net Asset Value Per Share Period Increase Decrease InvestmentCompanyNetAssetValuePerSharePeriodIncreaseDecrease	0.86
CY2021	us-gaap	Investment Company Net Asset Value Per Share Period Increase Decrease InvestmentCompanyNetAssetValuePerSharePeriodIncreaseDecrease	1.39
CY2020	us-gaap	Investment Company Net Asset Value Per Share Period Increase Decrease InvestmentCompanyNetAssetValuePerSharePeriodIncreaseDecrease	0.36
CY2019	us-gaap	Investment Company Net Asset Value Per Share Period Increase Decrease InvestmentCompanyNetAssetValuePerSharePeriodIncreaseDecrease	1.45
CY2023	us-gaap	Investment Company Distribution To Shareholders Per Share InvestmentCompanyDistributionToShareholdersPerShare	1.37
CY2022	us-gaap	Investment Company Distribution To Shareholders Per Share InvestmentCompanyDistributionToShareholdersPerShare	1.28
CY2020	us-gaap	Investment Company Distribution To Shareholders Per Share InvestmentCompanyDistributionToShareholdersPerShare	1.25
CY2019	us-gaap	Investment Company Distribution To Shareholders Per Share InvestmentCompanyDistributionToShareholdersPerShare	1.2
CY2023	hrzn	Investment Company Distribution To Shareholders Per Share Net Investment Income InvestmentCompanyDistributionToShareholdersPerShareNetInvestmentIncome	-1.37
CY2022	hrzn	Investment Company Distribution To Shareholders Per Share Net Investment Income InvestmentCompanyDistributionToShareholdersPerShareNetInvestmentIncome	-1.28
CY2021	hrzn	Investment Company Distribution To Shareholders Per Share Net Investment Income InvestmentCompanyDistributionToShareholdersPerShareNetInvestmentIncome	-1.25
CY2020	hrzn	Investment Company Distribution To Shareholders Per Share Net Investment Income InvestmentCompanyDistributionToShareholdersPerShareNetInvestmentIncome	-1.25
CY2019	hrzn	Investment Company Distribution To Shareholders Per Share Net Investment Income InvestmentCompanyDistributionToShareholdersPerShareNetInvestmentIncome	-1.2
CY2023Q4	hrzn	Investment Company Distribution To Shareholders Per Share Net Realized Gain On Investments InvestmentCompanyDistributionToShareholdersPerShareNetRealizedGainOnInvestments	0
CY2022Q4	hrzn	Investment Company Distribution To Shareholders Per Share Net Realized Gain On Investments InvestmentCompanyDistributionToShareholdersPerShareNetRealizedGainOnInvestments	0
CY2021Q4	hrzn	Investment Company Distribution To Shareholders Per Share Net Realized Gain On Investments InvestmentCompanyDistributionToShareholdersPerShareNetRealizedGainOnInvestments	0
CY2020Q4	hrzn	Investment Company Distribution To Shareholders Per Share Net Realized Gain On Investments InvestmentCompanyDistributionToShareholdersPerShareNetRealizedGainOnInvestments	0
CY2019Q4	hrzn	Investment Company Distribution To Shareholders Per Share Net Realized Gain On Investments InvestmentCompanyDistributionToShareholdersPerShareNetRealizedGainOnInvestments	0
CY2023	us-gaap	Investment Company Tax Return Of Capital Distribution Per Share InvestmentCompanyTaxReturnOfCapitalDistributionPerShare	0
CY2022	us-gaap	Investment Company Tax Return Of Capital Distribution Per Share InvestmentCompanyTaxReturnOfCapitalDistributionPerShare	0
CY2020	us-gaap	Investment Company Tax Return Of Capital Distribution Per Share InvestmentCompanyTaxReturnOfCapitalDistributionPerShare	0
CY2019	us-gaap	Investment Company Tax Return Of Capital Distribution Per Share InvestmentCompanyTaxReturnOfCapitalDistributionPerShare	0
CY2023	hrzn	Investment Company Distribution To Shareholders Per Share Other InvestmentCompanyDistributionToShareholdersPerShareOther	0.17
CY2022	hrzn	Investment Company Distribution To Shareholders Per Share Other InvestmentCompanyDistributionToShareholdersPerShareOther	0.33
CY2021	hrzn	Investment Company Distribution To Shareholders Per Share Other InvestmentCompanyDistributionToShareholdersPerShareOther	0.4
CY2020	hrzn	Investment Company Distribution To Shareholders Per Share Other InvestmentCompanyDistributionToShareholdersPerShareOther	0.08
CY2019	hrzn	Investment Company Distribution To Shareholders Per Share Other InvestmentCompanyDistributionToShareholdersPerShareOther	-0.06
CY2023Q4	us-gaap	Net Asset Value Per Share NetAssetValuePerShare	9.71
CY2022Q4	us-gaap	Net Asset Value Per Share NetAssetValuePerShare	11.47
CY2019Q4	us-gaap	Net Asset Value Per Share NetAssetValuePerShare	11.83
CY2022Q4	us-gaap	Share Price SharePrice	11.6
CY2021Q4	us-gaap	Share Price SharePrice	15.92
CY2020Q4	us-gaap	Share Price SharePrice	13.24
CY2019Q4	us-gaap	Share Price SharePrice	12.93
CY2018Q4	us-gaap	Share Price SharePrice	11.25
CY2023Q4	us-gaap	Share Price SharePrice	13.17
CY2022Q4	us-gaap	Share Price SharePrice	11.6
CY2021Q4	us-gaap	Share Price SharePrice	15.92
CY2020Q4	us-gaap	Share Price SharePrice	13.24
CY2019Q4	us-gaap	Share Price SharePrice	12.93
CY2021	us-gaap	Investment Company Tax Return Of Capital Distribution Per Share InvestmentCompanyTaxReturnOfCapitalDistributionPerShare	0
CY2020	us-gaap	Investment Company Tax Return Of Capital Distribution Per Share InvestmentCompanyTaxReturnOfCapitalDistributionPerShare	0
CY2019	us-gaap	Investment Company Tax Return Of Capital Distribution Per Share InvestmentCompanyTaxReturnOfCapitalDistributionPerShare	0
CY2023	hrzn	Investment Company Distribution To Shareholders Per Share Other InvestmentCompanyDistributionToShareholdersPerShareOther	0.17
CY2022	hrzn	Investment Company Distribution To Shareholders Per Share Other InvestmentCompanyDistributionToShareholdersPerShareOther	0.33
CY2021	hrzn	Investment Company Distribution To Shareholders Per Share Other InvestmentCompanyDistributionToShareholdersPerShareOther	0.4
CY2020	hrzn	Investment Company Distribution To Shareholders Per Share Other InvestmentCompanyDistributionToShareholdersPerShareOther	0.08
CY2019	hrzn	Investment Company Distribution To Shareholders Per Share Other InvestmentCompanyDistributionToShareholdersPerShareOther	-0.06
CY2023Q4	us-gaap	Net Asset Value Per Share NetAssetValuePerShare	9.71
CY2022Q4	us-gaap	Net Asset Value Per Share NetAssetValuePerShare	11.47
CY2021Q4	us-gaap	Net Asset Value Per Share NetAssetValuePerShare	11.56
CY2020Q4	us-gaap	Net Asset Value Per Share NetAssetValuePerShare	11.02
CY2019Q4	us-gaap	Net Asset Value Per Share NetAssetValuePerShare	11.83
CY2022Q4	us-gaap	Share Price SharePrice	11.6
CY2021Q4	us-gaap	Share Price SharePrice	15.92
CY2020Q4	us-gaap	Share Price SharePrice	13.24
CY2019Q4	us-gaap	Share Price SharePrice	12.93
CY2018Q4	us-gaap	Share Price SharePrice	11.25
CY2023Q4	us-gaap	Share Price SharePrice	13.17
CY2022Q4	us-gaap	Share Price SharePrice	11.6
CY2021Q4	us-gaap	Share Price SharePrice	15.92
CY2020Q4	us-gaap	Share Price SharePrice	13.24
CY2019Q4	us-gaap	Share Price SharePrice	12.93
CY2023	us-gaap	Investment Company Total Return InvestmentCompanyTotalReturn	0.253	pure
CY2022	us-gaap	Investment Company Total Return InvestmentCompanyTotalReturn	-0.193	pure
CY2021	us-gaap	Investment Company Total Return InvestmentCompanyTotalReturn	0.297	pure
CY2020	us-gaap	Investment Company Total Return InvestmentCompanyTotalReturn	0.121	pure
CY2019	us-gaap	Investment Company Total Return InvestmentCompanyTotalReturn	0.256	pure
CY2023Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	33367389
CY2022Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	27753373
CY2021Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	21217460
CY2020Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	19286356
CY2019Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	15563290
CY2023	us-gaap	Investment Company Expense Ratio Excluding Incentive Fee InvestmentCompanyExpenseRatioExcludingIncentiveFee	0.141	pure
CY2022	us-gaap	Investment Company Expense Ratio Excluding Incentive Fee InvestmentCompanyExpenseRatioExcludingIncentiveFee	0.115	pure
CY2021	us-gaap	Investment Company Expense Ratio Excluding Incentive Fee InvestmentCompanyExpenseRatioExcludingIncentiveFee	0.105	pure
CY2020	us-gaap	Investment Company Expense Ratio Excluding Incentive Fee InvestmentCompanyExpenseRatioExcludingIncentiveFee	0.10	pure
CY2019	us-gaap	Investment Company Expense Ratio Excluding Incentive Fee InvestmentCompanyExpenseRatioExcludingIncentiveFee	0.108	pure
CY2023	us-gaap	Investment Company Incentive Fee To Average Net Assets InvestmentCompanyIncentiveFeeToAverageNetAssets	0.009	pure
CY2022	us-gaap	Investment Company Incentive Fee To Average Net Assets InvestmentCompanyIncentiveFeeToAverageNetAssets	0.026	pure
CY2021	us-gaap	Investment Company Incentive Fee To Average Net Assets InvestmentCompanyIncentiveFeeToAverageNetAssets	0.031	pure
CY2020	us-gaap	Investment Company Incentive Fee To Average Net Assets InvestmentCompanyIncentiveFeeToAverageNetAssets	0.026	pure
CY2019	us-gaap	Investment Company Incentive Fee To Average Net Assets InvestmentCompanyIncentiveFeeToAverageNetAssets	0.032	pure
CY2023	us-gaap	Investment Company Expense Ratio Including Incentive Fee InvestmentCompanyExpenseRatioIncludingIncentiveFee	0.15	pure
CY2022	us-gaap	Investment Company Expense Ratio Including Incentive Fee InvestmentCompanyExpenseRatioIncludingIncentiveFee	0.141	pure
CY2021	us-gaap	Investment Company Expense Ratio Including Incentive Fee InvestmentCompanyExpenseRatioIncludingIncentiveFee	0.136	pure
CY2020	us-gaap	Investment Company Expense Ratio Including Incentive Fee InvestmentCompanyExpenseRatioIncludingIncentiveFee	0.126	pure
CY2019	us-gaap	Investment Company Expense Ratio Including Incentive Fee InvestmentCompanyExpenseRatioIncludingIncentiveFee	0.14	pure
CY2023	us-gaap	Investment Company Investment Income Loss Ratio After Incentive Allocation InvestmentCompanyInvestmentIncomeLossRatioAfterIncentiveAllocation	0.182	pure
CY2022	us-gaap	Investment Company Investment Income Loss Ratio After Incentive Allocation InvestmentCompanyInvestmentIncomeLossRatioAfterIncentiveAllocation	0.121	pure
CY2021	us-gaap	Investment Company Investment Income Loss Ratio After Incentive Allocation InvestmentCompanyInvestmentIncomeLossRatioAfterIncentiveAllocation	0.122	pure
CY2020	us-gaap	Investment Company Investment Income Loss Ratio After Incentive Allocation InvestmentCompanyInvestmentIncomeLossRatioAfterIncentiveAllocation	0.104	pure
CY2019	us-gaap	Investment Company Investment Income Loss Ratio After Incentive Allocation InvestmentCompanyInvestmentIncomeLossRatioAfterIncentiveAllocation	0.128	pure
CY2023	hrzn	Investment Company Expense Ratio Excluding Incentive Fee And Voluntary Fee Waiver InvestmentCompanyExpenseRatioExcludingIncentiveFeeAndVoluntaryFeeWaiver	0.141	pure
CY2023	us-gaap	Investment Company Total Return InvestmentCompanyTotalReturn	0.253	pure
CY2022	us-gaap	Investment Company Total Return InvestmentCompanyTotalReturn	-0.193	pure
CY2021	us-gaap	Investment Company Total Return InvestmentCompanyTotalReturn	0.297	pure
CY2020	us-gaap	Investment Company Total Return InvestmentCompanyTotalReturn	0.121	pure
CY2022Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	27753373
CY2021Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	21217460
CY2020Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	19286356
CY2019Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	15563290
CY2023	us-gaap	Investment Company Expense Ratio Excluding Incentive Fee InvestmentCompanyExpenseRatioExcludingIncentiveFee	0.141	pure
CY2022	us-gaap	Investment Company Expense Ratio Excluding Incentive Fee InvestmentCompanyExpenseRatioExcludingIncentiveFee	0.115	pure
CY2021	us-gaap	Investment Company Expense Ratio Excluding Incentive Fee InvestmentCompanyExpenseRatioExcludingIncentiveFee	0.105	pure
CY2020	us-gaap	Investment Company Expense Ratio Excluding Incentive Fee InvestmentCompanyExpenseRatioExcludingIncentiveFee	0.10	pure
CY2019	us-gaap	Investment Company Expense Ratio Excluding Incentive Fee InvestmentCompanyExpenseRatioExcludingIncentiveFee	0.108	pure
CY2023	us-gaap	Investment Company Incentive Fee To Average Net Assets InvestmentCompanyIncentiveFeeToAverageNetAssets	0.009	pure
CY2022	us-gaap	Investment Company Incentive Fee To Average Net Assets InvestmentCompanyIncentiveFeeToAverageNetAssets	0.026	pure
CY2021	us-gaap	Investment Company Incentive Fee To Average Net Assets InvestmentCompanyIncentiveFeeToAverageNetAssets	0.031	pure
CY2020	us-gaap	Investment Company Incentive Fee To Average Net Assets InvestmentCompanyIncentiveFeeToAverageNetAssets	0.026	pure
CY2019	us-gaap	Investment Company Incentive Fee To Average Net Assets InvestmentCompanyIncentiveFeeToAverageNetAssets	0.032	pure
CY2023	us-gaap	Investment Company Expense Ratio Including Incentive Fee InvestmentCompanyExpenseRatioIncludingIncentiveFee	0.15	pure
CY2022	us-gaap	Investment Company Expense Ratio Including Incentive Fee InvestmentCompanyExpenseRatioIncludingIncentiveFee	0.141	pure
CY2021	us-gaap	Investment Company Expense Ratio Including Incentive Fee InvestmentCompanyExpenseRatioIncludingIncentiveFee	0.136	pure
CY2020	us-gaap	Investment Company Expense Ratio Including Incentive Fee InvestmentCompanyExpenseRatioIncludingIncentiveFee	0.126	pure
CY2019	us-gaap	Investment Company Expense Ratio Including Incentive Fee InvestmentCompanyExpenseRatioIncludingIncentiveFee	0.14	pure
CY2023	us-gaap	Investment Company Investment Income Loss Ratio After Incentive Allocation InvestmentCompanyInvestmentIncomeLossRatioAfterIncentiveAllocation	0.182	pure
CY2022	us-gaap	Investment Company Investment Income Loss Ratio After Incentive Allocation InvestmentCompanyInvestmentIncomeLossRatioAfterIncentiveAllocation	0.121	pure
CY2021	us-gaap	Investment Company Investment Income Loss Ratio After Incentive Allocation InvestmentCompanyInvestmentIncomeLossRatioAfterIncentiveAllocation	0.122	pure
CY2020	us-gaap	Investment Company Investment Income Loss Ratio After Incentive Allocation InvestmentCompanyInvestmentIncomeLossRatioAfterIncentiveAllocation	0.104	pure
CY2019	us-gaap	Investment Company Investment Income Loss Ratio After Incentive Allocation InvestmentCompanyInvestmentIncomeLossRatioAfterIncentiveAllocation	0.128	pure
CY2023	hrzn	Investment Company Expense Ratio Excluding Incentive Fee And Voluntary Fee Waiver InvestmentCompanyExpenseRatioExcludingIncentiveFeeAndVoluntaryFeeWaiver	0.141	pure
CY2022	hrzn	Investment Company Expense Ratio Excluding Incentive Fee And Voluntary Fee Waiver InvestmentCompanyExpenseRatioExcludingIncentiveFeeAndVoluntaryFeeWaiver	0.115	pure
CY2020	hrzn	Investment Company Expense Ratio Excluding Incentive Fee And Voluntary Fee Waiver InvestmentCompanyExpenseRatioExcludingIncentiveFeeAndVoluntaryFeeWaiver	0.10	pure
CY2019	hrzn	Investment Company Expense Ratio Excluding Incentive Fee And Voluntary Fee Waiver InvestmentCompanyExpenseRatioExcludingIncentiveFeeAndVoluntaryFeeWaiver	0.108	pure
CY2022	hrzn	Investment Company Incentive Fee To Average Net Assets Excluding Voluntary Fee Waiver InvestmentCompanyIncentiveFeeToAverageNetAssetsExcludingVoluntaryFeeWaiver	0.026	pure
CY2021	hrzn	Investment Company Incentive Fee To Average Net Assets Excluding Voluntary Fee Waiver InvestmentCompanyIncentiveFeeToAverageNetAssetsExcludingVoluntaryFeeWaiver	0.031	pure
CY2020	hrzn	Investment Company Incentive Fee To Average Net Assets Excluding Voluntary Fee Waiver InvestmentCompanyIncentiveFeeToAverageNetAssetsExcludingVoluntaryFeeWaiver	0.026	pure
CY2019	hrzn	Investment Company Incentive Fee To Average Net Assets Excluding Voluntary Fee Waiver InvestmentCompanyIncentiveFeeToAverageNetAssetsExcludingVoluntaryFeeWaiver	0.044	pure
CY2023	hrzn	Investment Company Expense Ratio Excluding Voluntary Fee Waiver InvestmentCompanyExpenseRatioExcludingVoluntaryFeeWaiver	0.15	pure
CY2022	hrzn	Investment Company Expense Ratio Excluding Voluntary Fee Waiver InvestmentCompanyExpenseRatioExcludingVoluntaryFeeWaiver	0.141	pure
CY2021	hrzn	Investment Company Expense Ratio Excluding Voluntary Fee Waiver InvestmentCompanyExpenseRatioExcludingVoluntaryFeeWaiver	0.136	pure
CY2020	hrzn	Investment Company Expense Ratio Excluding Voluntary Fee Waiver InvestmentCompanyExpenseRatioExcludingVoluntaryFeeWaiver	0.126	pure
CY2019	hrzn	Investment Company Expense Ratio Excluding Voluntary Fee Waiver InvestmentCompanyExpenseRatioExcludingVoluntaryFeeWaiver	0.152	pure
CY2023	hrzn	Investment Company Investment Income Loss Ratio After Incentive Allocation Excluding Voluntary Fee Waiver InvestmentCompanyInvestmentIncomeLossRatioAfterIncentiveAllocationExcludingVoluntaryFeeWaiver	0.182	pure
CY2022	hrzn	Investment Company Investment Income Loss Ratio After Incentive Allocation Excluding Voluntary Fee Waiver InvestmentCompanyInvestmentIncomeLossRatioAfterIncentiveAllocationExcludingVoluntaryFeeWaiver	0.121	pure
CY2021	hrzn	Investment Company Investment Income Loss Ratio After Incentive Allocation Excluding Voluntary Fee Waiver InvestmentCompanyInvestmentIncomeLossRatioAfterIncentiveAllocationExcludingVoluntaryFeeWaiver	0.122	pure
CY2020	hrzn	Investment Company Investment Income Loss Ratio After Incentive Allocation Excluding Voluntary Fee Waiver InvestmentCompanyInvestmentIncomeLossRatioAfterIncentiveAllocationExcludingVoluntaryFeeWaiver	0.104	pure
CY2019	hrzn	Investment Company Investment Income Loss Ratio After Incentive Allocation Excluding Voluntary Fee Waiver InvestmentCompanyInvestmentIncomeLossRatioAfterIncentiveAllocationExcludingVoluntaryFeeWaiver	0.116	pure
CY2023Q4	hrzn	Net Assets NetAssets	323981000	usd
CY2022Q4	hrzn	Net Assets NetAssets	318448000	usd
CY2021Q4	hrzn	Net Assets NetAssets	245335000	usd
CY2020Q4	hrzn	Net Assets NetAssets	212597000	usd
CY2019Q4	hrzn	Net Assets NetAssets	184055000	usd
CY2023Q4	hrzn	Average Net Assets AverageNetAssets	336915000	usd
CY2022Q4	hrzn	Average Net Assets AverageNetAssets	299182000	usd
CY2021Q4	hrzn	Average Net Assets AverageNetAssets	231215000	usd
CY2022	hrzn	Investment Company Expense Ratio Excluding Incentive Fee And Voluntary Fee Waiver InvestmentCompanyExpenseRatioExcludingIncentiveFeeAndVoluntaryFeeWaiver	0.115	pure
CY2021	hrzn	Investment Company Expense Ratio Excluding Incentive Fee And Voluntary Fee Waiver InvestmentCompanyExpenseRatioExcludingIncentiveFeeAndVoluntaryFeeWaiver	0.105	pure
CY2020	hrzn	Investment Company Expense Ratio Excluding Incentive Fee And Voluntary Fee Waiver InvestmentCompanyExpenseRatioExcludingIncentiveFeeAndVoluntaryFeeWaiver	0.10	pure
CY2019	hrzn	Investment Company Expense Ratio Excluding Incentive Fee And Voluntary Fee Waiver InvestmentCompanyExpenseRatioExcludingIncentiveFeeAndVoluntaryFeeWaiver	0.108	pure
CY2023	hrzn	Investment Company Incentive Fee To Average Net Assets Excluding Voluntary Fee Waiver InvestmentCompanyIncentiveFeeToAverageNetAssetsExcludingVoluntaryFeeWaiver	0.009	pure
CY2022	hrzn	Investment Company Incentive Fee To Average Net Assets Excluding Voluntary Fee Waiver InvestmentCompanyIncentiveFeeToAverageNetAssetsExcludingVoluntaryFeeWaiver	0.026	pure
CY2021	hrzn	Investment Company Incentive Fee To Average Net Assets Excluding Voluntary Fee Waiver InvestmentCompanyIncentiveFeeToAverageNetAssetsExcludingVoluntaryFeeWaiver	0.031	pure
CY2020	hrzn	Investment Company Incentive Fee To Average Net Assets Excluding Voluntary Fee Waiver InvestmentCompanyIncentiveFeeToAverageNetAssetsExcludingVoluntaryFeeWaiver	0.026	pure
CY2019	hrzn	Investment Company Incentive Fee To Average Net Assets Excluding Voluntary Fee Waiver InvestmentCompanyIncentiveFeeToAverageNetAssetsExcludingVoluntaryFeeWaiver	0.044	pure
CY2023	hrzn	Investment Company Expense Ratio Excluding Voluntary Fee Waiver InvestmentCompanyExpenseRatioExcludingVoluntaryFeeWaiver	0.15	pure
CY2022	hrzn	Investment Company Expense Ratio Excluding Voluntary Fee Waiver InvestmentCompanyExpenseRatioExcludingVoluntaryFeeWaiver	0.141	pure
CY2020	hrzn	Investment Company Expense Ratio Excluding Voluntary Fee Waiver InvestmentCompanyExpenseRatioExcludingVoluntaryFeeWaiver	0.126	pure
CY2019	hrzn	Investment Company Expense Ratio Excluding Voluntary Fee Waiver InvestmentCompanyExpenseRatioExcludingVoluntaryFeeWaiver	0.152	pure
CY2023	hrzn	Investment Company Investment Income Loss Ratio After Incentive Allocation Excluding Voluntary Fee Waiver InvestmentCompanyInvestmentIncomeLossRatioAfterIncentiveAllocationExcludingVoluntaryFeeWaiver	0.182	pure
CY2022	hrzn	Investment Company Investment Income Loss Ratio After Incentive Allocation Excluding Voluntary Fee Waiver InvestmentCompanyInvestmentIncomeLossRatioAfterIncentiveAllocationExcludingVoluntaryFeeWaiver	0.121	pure
CY2021	hrzn	Investment Company Investment Income Loss Ratio After Incentive Allocation Excluding Voluntary Fee Waiver InvestmentCompanyInvestmentIncomeLossRatioAfterIncentiveAllocationExcludingVoluntaryFeeWaiver	0.122	pure
CY2020	hrzn	Investment Company Investment Income Loss Ratio After Incentive Allocation Excluding Voluntary Fee Waiver InvestmentCompanyInvestmentIncomeLossRatioAfterIncentiveAllocationExcludingVoluntaryFeeWaiver	0.104	pure
CY2019	hrzn	Investment Company Investment Income Loss Ratio After Incentive Allocation Excluding Voluntary Fee Waiver InvestmentCompanyInvestmentIncomeLossRatioAfterIncentiveAllocationExcludingVoluntaryFeeWaiver	0.116	pure
CY2023Q4	hrzn	Net Assets NetAssets	323981000	usd
CY2022Q4	hrzn	Net Assets NetAssets	318448000	usd
CY2021Q4	hrzn	Net Assets NetAssets	245335000	usd
CY2020Q4	hrzn	Net Assets NetAssets	212597000	usd
CY2019Q4	hrzn	Net Assets NetAssets	184055000	usd
CY2023Q4	hrzn	Average Net Assets AverageNetAssets	336915000	usd
CY2020Q4	hrzn	Average Net Assets AverageNetAssets	199302000	usd
CY2019Q4	hrzn	Average Net Assets AverageNetAssets	160008000	usd
CY2023	hrzn	Investment Company Average Debt Per Share InvestmentCompanyAverageDebtPerShare	13.93
CY2022	hrzn	Investment Company Average Debt Per Share InvestmentCompanyAverageDebtPerShare	13.7
CY2021	hrzn	Investment Company Average Debt Per Share InvestmentCompanyAverageDebtPerShare	11.27
CY2020	hrzn	Investment Company Average Debt Per Share InvestmentCompanyAverageDebtPerShare	9.97
CY2019	hrzn	Investment Company Average Debt Per Share InvestmentCompanyAverageDebtPerShare	10.05
CY2023	hrzn	Investment Company Portfolio Turnover Ratio InvestmentCompanyPortfolioTurnoverRatio	0.172	pure
CY2022	hrzn	Investment Company Portfolio Turnover Ratio InvestmentCompanyPortfolioTurnoverRatio	0.146	pure
CY2021	hrzn	Investment Company Portfolio Turnover Ratio InvestmentCompanyPortfolioTurnoverRatio	0.454	pure
CY2020	hrzn	Investment Company Portfolio Turnover Ratio InvestmentCompanyPortfolioTurnoverRatio	0.387	pure
CY2019	us-gaap	Investment Company Voluntary Fee Waived InvestmentCompanyVoluntaryFeeWaived	1800000	usd
CY2020Q4	hrzn	Average Net Assets AverageNetAssets	199302000	usd
CY2019Q4	hrzn	Average Net Assets AverageNetAssets	160008000	usd
CY2023	hrzn	Investment Company Average Debt Per Share InvestmentCompanyAverageDebtPerShare	13.93
CY2022	hrzn	Investment Company Average Debt Per Share InvestmentCompanyAverageDebtPerShare	13.7
CY2021	hrzn	Investment Company Average Debt Per Share InvestmentCompanyAverageDebtPerShare	11.27
CY2020	hrzn	Investment Company Average Debt Per Share InvestmentCompanyAverageDebtPerShare	9.97
CY2019	hrzn	Investment Company Average Debt Per Share InvestmentCompanyAverageDebtPerShare	10.05
CY2023	hrzn	Investment Company Portfolio Turnover Ratio InvestmentCompanyPortfolioTurnoverRatio	0.172	pure
CY2022	hrzn	Investment Company Portfolio Turnover Ratio InvestmentCompanyPortfolioTurnoverRatio	0.146	pure
CY2021	hrzn	Investment Company Portfolio Turnover Ratio InvestmentCompanyPortfolioTurnoverRatio	0.454	pure
CY2020	hrzn	Investment Company Portfolio Turnover Ratio InvestmentCompanyPortfolioTurnoverRatio	0.387	pure
CY2019	hrzn	Investment Company Portfolio Turnover Ratio InvestmentCompanyPortfolioTurnoverRatio	0.82	pure
CY2019	us-gaap	Investment Company Voluntary Fee Waived InvestmentCompanyVoluntaryFeeWaived	1800000	usd

Files In Submission

Name	View Source	Status
FilingSummary.xml	Edgar Link	unprocessable
hrzn-20231231_cal.xml	Edgar Link	unprocessable
0001437749-24-005719-index-headers.html	Edgar Link	pending
0001437749-24-005719-index.html	Edgar Link	pending
0001437749-24-005719.txt	Edgar Link	pending
0001437749-24-005719-xbrl.zip	Edgar Link	pending
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Financial_Report.xlsx	Edgar Link	pending
hrzn-20231231.xsd	Edgar Link	pending
hrzn20221231_10kimg001.jpg	Edgar Link	pending
hrzn20231231_10k.htm	Edgar Link	pending
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hrzn-20231231_def.xml	Edgar Link	unprocessable
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hrzn20231231_10k_htm.xml	Edgar Link	completed
0001437749-24-005719-index-headers.html	Edgar Link	pending
0001437749-24-005719-index.html	Edgar Link	pending
0001437749-24-005719.txt	Edgar Link	pending
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ex_627234.htm	Edgar Link	pending
Financial_Report.xlsx	Edgar Link	pending
hrzn-20231231.xsd	Edgar Link	pending
hrzn20221231_10kimg001.jpg	Edgar Link	pending
hrzn20231231_10k.htm	Edgar Link	pending
htfheader01.jpg	Edgar Link	pending
ippimg.jpg	Edgar Link	pending
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hrzn-20231231_def.xml	Edgar Link	unprocessable
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hrzn-20231231_pre.xml	Edgar Link	unprocessable
hrzn20231231_10k_htm.xml	Edgar Link	completed
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report.css	Edgar Link	pending
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FilingSummary.xml	Edgar Link	unprocessable
hrzn-20231231_cal.xml	Edgar Link	unprocessable

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$HRZN
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2024 Q1 Form 10-K Financial Statement

#000143774924005719 Filed on February 27, 2024

Income Statement

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$HRZN Horizon Technology Finance Corp Stock $hrzn

2024 Q1 Form 10-K Financial Statement

#000143774924005719 Filed on February 27, 2024

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$HRZN
Horizon Technology Finance Corp Stock $hrzn