$OLP
ONE LIBERTY PROPERTIES INC Stock $olp

$olp Overview Financials Valuation SEC Filings Company Website

2020 Q4 Form 10-K Financial Statement

#000155837021002931 Filed on March 12, 2021

Income Statement

Concept	2020 Q4	2020 Q1	2019 Q4
Revenue	$18.73M	$21.24M	$22.45M
YoY Change	-16.55%	0.4%	10.74%
Cost Of Revenue	$3.470M	$3.290M	$3.490M
YoY Change	-0.57%	0.0%	-3.06%
Gross Profit	$15.26M	$17.95M	$18.96M
YoY Change	-19.51%	0.45%	13.74%
Gross Profit Margin	81.46%	84.51%	84.46%
Selling, General & Admin	$3.580M	$3.470M	$3.250M
YoY Change	10.15%	5.15%	7.62%
% of Gross Profit	23.46%	19.33%	17.14%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$5.760M	$5.674M	$5.680M
YoY Change	1.41%	6.12%	-29.53%
% of Gross Profit	37.75%	31.61%	29.96%
Operating Expenses	$9.340M	$12.43M	$8.930M
YoY Change	4.59%	4.14%	-19.33%
Operating Profit	$5.920M	$13.06M	$10.03M
YoY Change	-40.98%	41.68%	79.11%
Interest Expense	-$5.100M	$4.884M	-$5.000M
YoY Change	2.0%	0.45%	13.64%
% of Operating Profit	-86.15%	37.4%	-49.85%
Other Income/Expense, Net	$30.00K	-$290.0K	-$840.0K
YoY Change	-103.57%		-220.0%
Pretax Income	$3.570M	$7.830M	$4.880M
YoY Change	-26.84%	95.26%	2611.11%
Income Tax
% Of Pretax Income
Net Earnings	$3.572M	$7.826M	$4.810M
YoY Change	-25.74%	97.08%	3106.67%
Net Earnings / Revenue	19.07%	36.85%	21.43%
Basic Earnings Per Share	$0.16	$0.39	$0.23
Diluted Earnings Per Share	$0.16	$0.39	$0.23
COMMON SHARES
Basic Shares Outstanding	19.84M	19.36M	19.25M
Diluted Shares Outstanding	19.87M	19.37M	19.27M

Balance Sheet

Concept	2020 Q4	2020 Q1	2019 Q4
SHORT-TERM ASSETS
Cash & Short-Term Investments	$12.70M	$21.40M	$11.00M
YoY Change	15.45%	67.19%	-27.63%
Cash & Equivalents	$12.71M	$21.36M	$11.03M
Short-Term Investments
Other Short-Term Assets
YoY Change
Inventory
Prepaid Expenses
Receivables	$15.40M	$15.30M	$15.00M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$28.10M	$36.70M	$26.00M
YoY Change	8.08%	36.94%	-10.03%
LONG-TERM ASSETS
Property, Plant & Equipment	$691.9M	$718.7M	$700.5M
YoY Change	-1.23%	2.32%	-0.71%
Goodwill
YoY Change
Intangibles
YoY Change
Long-Term Investments	$10.70M	$11.20M	$11.10M
YoY Change	-3.6%	4.67%	1.83%
Other Assets	$20.70M	$10.50M	$10.90M
YoY Change	89.91%	-7.89%	19.78%
Total Long-Term Assets	$748.0M	$769.1M	$748.6M
YoY Change	-0.08%	2.55%	-0.45%
TOTAL ASSETS
Total Short-Term Assets	$28.10M	$36.70M	$26.00M
Total Long-Term Assets	$748.0M	$769.1M	$748.6M
Total Assets	$776.1M	$805.8M	$774.6M
YoY Change	0.19%	3.74%	-0.8%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable
YoY Change
Accrued Expenses	$21.50M	$12.90M	$12.90M
YoY Change	66.67%	-2.27%	16.22%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$30.80M	$21.90M	$21.90M
YoY Change	40.64%	-0.45%	10.61%
LONG-TERM LIABILITIES
Long-Term Debt	$442.2M	$477.6M	$446.7M
YoY Change	-1.01%	7.4%	-0.4%
Other Long-Term Liabilities	$11.20M	$19.10M	$14.10M
YoY Change	-20.57%	30.82%	0.71%
Total Long-Term Liabilities	$453.4M	$496.7M	$460.8M
YoY Change	-1.61%	8.14%	-0.37%
TOTAL LIABILITIES
Total Short-Term Liabilities	$30.80M	$21.90M	$21.90M
Total Long-Term Liabilities	$453.4M	$496.7M	$460.8M
Total Liabilities	$484.2M	$518.7M	$482.6M
YoY Change	0.32%	7.43%	0.07%
SHAREHOLDERS EQUITY
Retained Earnings	-$37.54M	-$29.59M	-$28.38M
YoY Change	32.26%		164.51%
Common Stock	$333.3M	$321.9M	$320.8M
YoY Change	3.91%		4.83%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$290.8M	$285.9M	$290.8M
YoY Change
Total Liabilities & Shareholders Equity	$776.1M	$805.8M	$774.6M
YoY Change	0.19%	3.74%	-0.8%

Cashflow Statement

Concept	2020 Q4	2020 Q1	2019 Q4
OPERATING ACTIVITIES
Net Income	$3.572M	$7.826M	$4.810M
YoY Change	-25.74%	97.08%	3106.67%
Depreciation, Depletion And Amortization	$5.760M	$5.674M	$5.680M
YoY Change	1.41%	6.12%	-29.53%
Cash From Operating Activities	$9.450M	$10.05M	$8.380M
YoY Change	12.77%	23.86%	-35.64%
INVESTING ACTIVITIES
Capital Expenditures	-$400.0K	-$28.61M	-$10.11M
YoY Change	-96.04%	4046.38%	-83.78%
Acquisitions
YoY Change
Other Investing Activities	$4.380M	$7.090M	$17.60M
YoY Change	-75.11%	70800.0%	82.01%
Cash From Investing Activities	$3.980M	-$21.52M	$7.470M
YoY Change	-46.72%	3083.43%	-114.19%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-14.67M	21.91M	-15.11M
YoY Change	-2.91%	-309.46%	-139.19%
NET CHANGE
Cash From Operating Activities	9.450M	10.05M	8.380M
Cash From Investing Activities	3.980M	-21.52M	7.470M
Cash From Financing Activities	-14.67M	21.91M	-15.11M
Net Change In Cash	-1.240M	10.44M	740.0K
YoY Change	-267.57%	-445.63%	-169.16%
FREE CASH FLOW
Cash From Operating Activities	$9.450M	$10.05M	$8.380M
Capital Expenditures	-$400.0K	-$28.61M	-$10.11M
Free Cash Flow	$9.850M	$38.66M	$18.49M
YoY Change	-46.73%	339.08%	-75.46%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value
CY2020Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies
CY2019Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies
CY2020	dei	Entity Central Index Key EntityCentralIndexKey	0000712770
CY2020	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2020	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2020
CY2020	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2020	dei	Amendment Flag AmendmentFlag	false
CY2020	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	MD
CY2020Q4	us-gaap	Preferred Stock Value PreferredStockValue
CY2019Q4	us-gaap	Preferred Stock Value PreferredStockValue
CY2019Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	19251000
CY2020Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	19878000
CY2020	us-gaap	Lessor Operating Lease Existence Of Option To Extend LessorOperatingLeaseExistenceOfOptionToExtend	true
CY2020	us-gaap	Lessor Operating Lease Existence Of Option To Terminate LessorOperatingLeaseExistenceOfOptionToTerminate	true
CY2020Q4	us-gaap	Lease Practical Expedient Lessor Single Lease Component LeasePracticalExpedientLessorSingleLeaseComponent	false
CY2020Q4	us-gaap	Operating Lease Liability Statement Of Financial Position Extensible List OperatingLeaseLiabilityStatementOfFinancialPositionExtensibleList	us-gaap:AccruedLiabilitiesCurrentAndNoncurrent
CY2020Q4	olp	Escrow Deposits And Other Assets And Receivables EscrowDepositsAndOtherAssetsAndReceivables	20667000
CY2019Q4	olp	Escrow Deposits And Other Assets And Receivables EscrowDepositsAndOtherAssetsAndReceivables	10894000
CY2020Q4	us-gaap	Assets Assets	776137000
CY2019Q4	us-gaap	Deferred Rent Receivables Net DeferredRentReceivablesNet	15037000
CY2020Q4	olp	Unamortized Intangible Lease Assets UnamortizedIntangibleLeaseAssets	24703000
CY2019Q4	olp	Unamortized Intangible Lease Assets UnamortizedIntangibleLeaseAssets	26068000
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset Statement Of Financial Position Extensible List OperatingLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList	olp:EscrowDepositsAndOtherAssetsAndReceivables
CY2020Q4	us-gaap	Operating Lease Liability Statement Of Financial Position Extensible List OperatingLeaseLiabilityStatementOfFinancialPositionExtensibleList	us-gaap:AccruedLiabilitiesCurrentAndNoncurrent
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset Statement Of Financial Position Extensible List OperatingLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList	olp:EscrowDepositsAndOtherAssetsAndReceivables
CY2020Q4	us-gaap	Operating Lease Liability Statement Of Financial Position Extensible List OperatingLeaseLiabilityStatementOfFinancialPositionExtensibleList	us-gaap:AccruedLiabilitiesCurrentAndNoncurrent
CY2020	olp	Subsequent Disqualification Period If Failed To Qualify As Reit SubsequentDisqualificationPeriodIfFailedToQualifyAsREIT	P4Y
CY2020	dei	Document Type DocumentType	10-K
CY2020	dei	Document Annual Report DocumentAnnualReport	true
CY2020	dei	Document Period End Date DocumentPeriodEndDate	2020-12-31
CY2020	dei	Document Transition Report DocumentTransitionReport	false
CY2020	dei	Entity File Number EntityFileNumber	001-09279
CY2020	dei	Entity Registrant Name EntityRegistrantName	ONE LIBERTY PROPERTIES, INC.
CY2020	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	13-3147497
CY2020	dei	Entity Address Address Line1 EntityAddressAddressLine1	60 Cutter Mill Road
CY2020	dei	Entity Address City Or Town EntityAddressCityOrTown	Great Neck
CY2020	dei	Entity Address State Or Province EntityAddressStateOrProvince	NY
CY2020	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	11021
CY2020	dei	City Area Code CityAreaCode	516
CY2020	dei	Local Phone Number LocalPhoneNumber	466-3100
CY2020	dei	Security12b Title Security12bTitle	Common Stock
CY2020	dei	Trading Symbol TradingSymbol	OLP
CY2020	dei	Security Exchange Name SecurityExchangeName	NYSE
CY2020	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	No
CY2020	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2020	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2020	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2020	dei	Entity Filer Category EntityFilerCategory	Non-accelerated Filer
CY2020	dei	Entity Small Business EntitySmallBusiness	true
CY2020	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2020	dei	Icfr Auditor Attestation Flag IcfrAuditorAttestationFlag	false
CY2020	dei	Entity Shell Company EntityShellCompany	false
CY2020Q2	dei	Entity Public Float EntityPublicFloat	278000000
CY2021Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	20732353
CY2020Q4	us-gaap	Land Land	190391000
CY2019Q4	us-gaap	Land Land	195320000
CY2020Q4	us-gaap	Investment Building And Building Improvements InvestmentBuildingAndBuildingImprovements	648667000
CY2019Q4	us-gaap	Investment Building And Building Improvements InvestmentBuildingAndBuildingImprovements	640517000
CY2020Q4	us-gaap	Real Estate Investment Property At Cost RealEstateInvestmentPropertyAtCost	839058000
CY2019Q4	us-gaap	Real Estate Investment Property At Cost RealEstateInvestmentPropertyAtCost	835837000
CY2020Q4	us-gaap	Real Estate Investment Property Accumulated Depreciation RealEstateInvestmentPropertyAccumulatedDepreciation	147136000
CY2019Q4	us-gaap	Real Estate Investment Property Accumulated Depreciation RealEstateInvestmentPropertyAccumulatedDepreciation	135302000
CY2020Q4	us-gaap	Real Estate Investment Property Net RealEstateInvestmentPropertyNet	691922000
CY2019Q4	us-gaap	Real Estate Investment Property Net RealEstateInvestmentPropertyNet	700535000
CY2020Q4	us-gaap	Real Estate Investments Unconsolidated Real Estate And Other Joint Ventures RealEstateInvestmentsUnconsolidatedRealEstateAndOtherJointVentures	10702000
CY2019Q4	us-gaap	Real Estate Investments Unconsolidated Real Estate And Other Joint Ventures RealEstateInvestmentsUnconsolidatedRealEstateAndOtherJointVentures	11061000
CY2020Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	12705000
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	11034000
CY2020Q4	us-gaap	Deferred Rent Receivables Net DeferredRentReceivablesNet	15438000
CY2019Q4	us-gaap	Assets Assets	774629000
CY2020Q4	us-gaap	Secured Debt SecuredDebt	429704000
CY2019Q4	us-gaap	Secured Debt SecuredDebt	435840000
CY2020Q4	us-gaap	Line Of Credit LineOfCredit	12525000
CY2019Q4	us-gaap	Line Of Credit LineOfCredit	10831000
CY2020Q4	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	9261000
CY2019Q4	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	8966000
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CY2019Q4	us-gaap	Accrued Liabilities Current And Noncurrent AccruedLiabilitiesCurrentAndNoncurrent	14587000
CY2020Q4	us-gaap	Off Market Lease Unfavorable OffMarketLeaseUnfavorable	11189000
CY2019Q4	us-gaap	Off Market Lease Unfavorable OffMarketLeaseUnfavorable	12421000
CY2020Q4	us-gaap	Liabilities Liabilities	484177000
CY2019Q4	us-gaap	Liabilities Liabilities	482645000
CY2019Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	1
CY2020Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	1
CY2019Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	12500000
CY2020Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	12500000
CY2019Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0
CY2020Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0
CY2019Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	1
CY2020Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	1
CY2020Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	50000000
CY2019Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	25000000
CY2020Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	19878000
CY2019Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	19251000
CY2020Q4	us-gaap	Common Stock Value CommonStockValue	19878000
CY2019Q4	us-gaap	Common Stock Value CommonStockValue	19251000
CY2020Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	313430000
CY2019Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	301517000
CY2020Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-5002000
CY2019Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-1623000
CY2020Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	-37539000
CY2019Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	-28382000
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	290767000
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	290763000
CY2020Q4	us-gaap	Minority Interest MinorityInterest	1193000
CY2019Q4	us-gaap	Minority Interest MinorityInterest	1221000
CY2020Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	291960000
CY2019Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	291984000
CY2020Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	776137000
CY2019Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	774629000
CY2020	us-gaap	Revenues Revenues	81903000
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CY2018	us-gaap	Revenues Revenues	79126000
CY2020	us-gaap	Depreciation And Amortization DepreciationAndAmortization	22964000
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CY2020	olp	Real Estate Operating Expenses RealEstateOperatingExpenses	13634000
CY2019	olp	Real Estate Operating Expenses RealEstateOperatingExpenses	14074000
CY2018	olp	Real Estate Operating Expenses RealEstateOperatingExpenses	11596000
CY2020	olp	Federal Excise And State Tax Paid And Or Accrued FederalExciseAndStateTaxPaidAndOrAccrued	310000
CY2019	olp	Federal Excise And State Tax Paid And Or Accrued FederalExciseAndStateTaxPaidAndOrAccrued	348000
CY2018	olp	Federal Excise And State Tax Paid And Or Accrued FederalExciseAndStateTaxPaidAndOrAccrued	370000
CY2020	us-gaap	Impairment Of Real Estate ImpairmentOfRealEstate	430000
CY2020	us-gaap	Operating Expenses OperatingExpenses	51009000
CY2019	us-gaap	Operating Expenses OperatingExpenses	48890000
CY2018	us-gaap	Operating Expenses OperatingExpenses	48058000
CY2020	olp	Gain Loss On Disposition Of Real Estate GainLossOnDispositionOfRealEstate	17280000
CY2019	olp	Gain Loss On Disposition Of Real Estate GainLossOnDispositionOfRealEstate	4327000
CY2018	olp	Gain Loss On Disposition Of Real Estate GainLossOnDispositionOfRealEstate	5262000
CY2020	us-gaap	Operating Income Loss OperatingIncomeLoss	48174000
CY2019	us-gaap	Operating Income Loss OperatingIncomeLoss	40173000
CY2018	us-gaap	Operating Income Loss OperatingIncomeLoss	36330000
CY2020	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	38000
CY2019	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	16000
CY2018	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	1304000
CY2020	olp	Gain Loss On Disposition Of Real Estate Unconsolidated Joint Venture GainLossOnDispositionOfRealEstateUnconsolidatedJointVenture	121000
CY2018	olp	Gain Loss On Disposition Of Real Estate Unconsolidated Joint Venture GainLossOnDispositionOfRealEstateUnconsolidatedJointVenture	2057000
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CY2020	us-gaap	Insurance Recoveries InsuranceRecoveries	430000
CY2020	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	496000
CY2019	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	8000
CY2018	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	720000
CY2020	us-gaap	Interest Expense InterestExpense	19317000
CY2019	us-gaap	Interest Expense InterestExpense	19831000
CY2018	us-gaap	Interest Expense InterestExpense	17862000
CY2020	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	976000
CY2019	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	995000
CY2018	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	985000
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CY2019	us-gaap	Profit Loss ProfitLoss	18544000
CY2018	us-gaap	Profit Loss ProfitLoss	21564000
CY2020	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	6000
CY2019	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	533000
CY2018	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	899000
CY2020	us-gaap	Net Income Loss NetIncomeLoss	27407000
CY2019	us-gaap	Net Income Loss NetIncomeLoss	18011000
CY2018	us-gaap	Net Income Loss NetIncomeLoss	20665000
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	19571000
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	19090000
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	18575000
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	19599000
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	19119000
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	18588000
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.34
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.88
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.05
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.33
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.88
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.05
CY2020	us-gaap	Profit Loss ProfitLoss	27413000
CY2019	us-gaap	Profit Loss ProfitLoss	18544000
CY2018	us-gaap	Profit Loss ProfitLoss	21564000
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CY2019	olp	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassification	-3522000
CY2018	olp	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassification	2170000
CY2018	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	398000
CY2018	olp	Derivative Instruments Gain Loss Reclassified From Accumulated Oci Into Equity Earnings Effective Portion Net DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOciIntoEquityEarningsEffectivePortionNet	110000
CY2018	olp	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Company Share From Joint Venture OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesCompanyShareFromJointVenture	76000
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-3383000
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-3522000
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	1738000
CY2020	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	24030000
CY2019	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	15022000
CY2018	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	23302000
CY2020	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	6000
CY2019	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	533000
CY2018	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	899000
CY2020	olp	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Noncontrolling Interest OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationNoncontrollingInterest	-4000
CY2019	olp	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Noncontrolling Interest OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationNoncontrollingInterest	-9000
CY2018	olp	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Noncontrolling Interest OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationNoncontrollingInterest	3000
CY2020	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	24028000
CY2019	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	14498000
CY2018	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	22400000
CY2017Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	298502000
CY2018	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	1.80
CY2018	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	34652000
CY2018	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	3138000
CY2018	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	5990000
CY2018	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	1195000
CY2018	us-gaap	Adjustments To Additional Paid In Capital Share Based Compensation Restricted Stock Units Requisite Service Period Recognition AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition	3510000
CY2018	us-gaap	Profit Loss ProfitLoss	21564000
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	1738000
CY2018Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	298595000
CY2019	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	1.80
CY2019	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	35663000
CY2019	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	5200000
CY2019	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	5712000
CY2019	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	752000
CY2019	us-gaap	Adjustments To Additional Paid In Capital Share Based Compensation Restricted Stock Units Requisite Service Period Recognition AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition	3870000
CY2019	olp	Payments To Brokers For Commissions Classified As Operating Activities PaymentsToBrokersForCommissionsClassifiedAsOperatingActivities	523000
CY2019	us-gaap	Profit Loss ProfitLoss	18544000
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-3522000
CY2019Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	291984000
CY2020	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	1.46
CY2020	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	29736000
CY2020	olp	Common Stock Dividends Per Share Stock Distributions CommonStockDividendsPerShareStockDistributions	0.34
CY2020	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	1026000
CY2020	us-gaap	Noncontrolling Interest Increase From Business Combination NoncontrollingInterestIncreaseFromBusinessCombination	10000
CY2020	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	40000
CY2020	us-gaap	Adjustments To Additional Paid In Capital Share Based Compensation Restricted Stock Units Requisite Service Period Recognition AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition	4686000
CY2020	us-gaap	Profit Loss ProfitLoss	27413000
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-3383000
CY2020Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	291960000
CY2020	us-gaap	Profit Loss ProfitLoss	27413000
CY2019	us-gaap	Profit Loss ProfitLoss	18544000
CY2018	us-gaap	Profit Loss ProfitLoss	21564000
CY2020	olp	Gain Loss On Sale Of Property Cash Flow Impact GainLossOnSaleOfPropertyCashFlowImpact	17280000
CY2019	olp	Gain Loss On Sale Of Property Cash Flow Impact GainLossOnSaleOfPropertyCashFlowImpact	4327000
CY2018	olp	Gain Loss On Sale Of Property Cash Flow Impact GainLossOnSaleOfPropertyCashFlowImpact	5262000
CY2020	us-gaap	Impairment Of Real Estate ImpairmentOfRealEstate	430000
CY2020	us-gaap	Straight Line Rent StraightLineRent	1722000
CY2019	us-gaap	Straight Line Rent StraightLineRent	1547000
CY2018	us-gaap	Straight Line Rent StraightLineRent	1156000
CY2020	olp	Writeoff Of Unbilled Rent Receivable WriteoffOfUnbilledRentReceivable	-1094000
CY2019	olp	Writeoff Of Unbilled Rent Receivable WriteoffOfUnbilledRentReceivable	-585000
CY2018	olp	Writeoff Of Unbilled Rent Receivable WriteoffOfUnbilledRentReceivable	-1514000
CY2018	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	684000
CY2020	us-gaap	Amortization Of Above And Below Market Leases AmortizationOfAboveAndBelowMarketLeases	-780000
CY2019	us-gaap	Amortization Of Above And Below Market Leases AmortizationOfAboveAndBelowMarketLeases	-914000
CY2018	us-gaap	Amortization Of Above And Below Market Leases AmortizationOfAboveAndBelowMarketLeases	-1849000
CY2020	us-gaap	Share Based Compensation ShareBasedCompensation	4686000
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	3870000
CY2018	us-gaap	Share Based Compensation ShareBasedCompensation	3510000
CY2020	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	38000
CY2019	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	16000
CY2018	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	1304000
CY2020	olp	Gain Loss On Disposition Of Real Estate Unconsolidated Joint Venture GainLossOnDispositionOfRealEstateUnconsolidatedJointVenture	121000
CY2018	olp	Gain Loss On Disposition Of Real Estate Unconsolidated Joint Venture GainLossOnDispositionOfRealEstateUnconsolidatedJointVenture	2057000
CY2020	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	208000
CY2019	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	97000
CY2018	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	2341000
CY2020	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	22964000
CY2019	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	22026000
CY2018	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	24155000
CY2020	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	976000
CY2019	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	995000
CY2018	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	985000
CY2020	olp	Payments To Brokers For Commissions Classified As Operating Activities PaymentsToBrokersForCommissionsClassifiedAsOperatingActivities	235000
CY2018	olp	Payments To Brokers For Commissions Classified As Operating Activities PaymentsToBrokersForCommissionsClassifiedAsOperatingActivities	442000
CY2020	us-gaap	Increase Decrease In Operating Assets IncreaseDecreaseInOperatingAssets	3146000
CY2019	us-gaap	Increase Decrease In Operating Assets IncreaseDecreaseInOperatingAssets	-129000
CY2018	us-gaap	Increase Decrease In Operating Assets IncreaseDecreaseInOperatingAssets	1183000
CY2020	us-gaap	Increase Decrease In Operating Liabilities IncreaseDecreaseInOperatingLiabilities	677000
CY2019	us-gaap	Increase Decrease In Operating Liabilities IncreaseDecreaseInOperatingLiabilities	-2687000
CY2018	us-gaap	Increase Decrease In Operating Liabilities IncreaseDecreaseInOperatingLiabilities	1146000
CY2020	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	35126000
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	36232000
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	42646000
CY2020	us-gaap	Payments To Acquire Real Estate PaymentsToAcquireRealEstate	28504000
CY2019	us-gaap	Payments To Acquire Real Estate PaymentsToAcquireRealEstate	49887000
CY2018	us-gaap	Payments To Acquire Real Estate PaymentsToAcquireRealEstate	80290000
CY2020	us-gaap	Payments To Develop Real Estate Assets PaymentsToDevelopRealEstateAssets	1037000
CY2019	us-gaap	Payments To Develop Real Estate Assets PaymentsToDevelopRealEstateAssets	3514000
CY2018	us-gaap	Payments To Develop Real Estate Assets PaymentsToDevelopRealEstateAssets	7311000
CY2020	us-gaap	Proceeds From Sale Of Real Estate Heldforinvestment ProceedsFromSaleOfRealEstateHeldforinvestment	29413000
CY2019	us-gaap	Proceeds From Sale Of Real Estate Heldforinvestment ProceedsFromSaleOfRealEstateHeldforinvestment	40761000
CY2018	us-gaap	Proceeds From Sale Of Real Estate Heldforinvestment ProceedsFromSaleOfRealEstateHeldforinvestment	27088000
CY2020	olp	Proceeds From Insurance Recoveries Related To Casualty Loss Claims ProceedsFromInsuranceRecoveriesRelatedToCasualtyLossClaims	150000
CY2019	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	296000
CY2020	us-gaap	Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital	311000
CY2019	us-gaap	Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital	11000
CY2018	us-gaap	Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital	852000
CY2020	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	333000
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-12925000
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-59661000
CY2020	olp	Payments Of Amortization Of Mortgages Payable PaymentsOfAmortizationOfMortgagesPayable	13114000
CY2019	olp	Payments Of Amortization Of Mortgages Payable PaymentsOfAmortizationOfMortgagesPayable	13158000
CY2018	olp	Payments Of Amortization Of Mortgages Payable PaymentsOfAmortizationOfMortgagesPayable	11081000
CY2020	us-gaap	Repayments Of Secured Debt RepaymentsOfSecuredDebt	11815000
CY2019	us-gaap	Repayments Of Secured Debt RepaymentsOfSecuredDebt	19970000
CY2018	us-gaap	Repayments Of Secured Debt RepaymentsOfSecuredDebt	24502000
CY2020	us-gaap	Proceeds From Issuance Of Secured Debt ProceedsFromIssuanceOfSecuredDebt	18200000
CY2019	us-gaap	Proceeds From Issuance Of Secured Debt ProceedsFromIssuanceOfSecuredDebt	50310000
CY2018	us-gaap	Proceeds From Issuance Of Secured Debt ProceedsFromIssuanceOfSecuredDebt	61733000
CY2019	olp	Proceeds From Issuance Of Common Stock Net ProceedsFromIssuanceOfCommonStockNet	5200000
CY2018	olp	Proceeds From Issuance Of Common Stock Net ProceedsFromIssuanceOfCommonStockNet	3138000
CY2020	us-gaap	Proceeds From Long Term Lines Of Credit ProceedsFromLongTermLinesOfCredit	41500000
CY2019	us-gaap	Proceeds From Long Term Lines Of Credit ProceedsFromLongTermLinesOfCredit	54550000
CY2018	us-gaap	Proceeds From Long Term Lines Of Credit ProceedsFromLongTermLinesOfCredit	74500000
CY2020	us-gaap	Repayments Of Long Term Lines Of Credit RepaymentsOfLongTermLinesOfCredit	40000000
CY2019	us-gaap	Repayments Of Long Term Lines Of Credit RepaymentsOfLongTermLinesOfCredit	73100000
CY2018	us-gaap	Repayments Of Long Term Lines Of Credit RepaymentsOfLongTermLinesOfCredit	53900000
CY2020	us-gaap	Proceeds From Issuance Of Common Stock Dividend Reinvestment Plan ProceedsFromIssuanceOfCommonStockDividendReinvestmentPlan	1026000
CY2019	us-gaap	Proceeds From Issuance Of Common Stock Dividend Reinvestment Plan ProceedsFromIssuanceOfCommonStockDividendReinvestmentPlan	5712000
CY2018	us-gaap	Proceeds From Issuance Of Common Stock Dividend Reinvestment Plan ProceedsFromIssuanceOfCommonStockDividendReinvestmentPlan	5990000
CY2020	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	189000
CY2019	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	1443000
CY2018	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	1182000
CY2020	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	10000
CY2020	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	40000
CY2019	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	752000
CY2018	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	1195000
CY2020	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	29441000
CY2019	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	35421000
CY2018	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	34421000
CY2020	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-33863000
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-28072000
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	19080000
CY2020	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	1596000
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	-4765000
CY2018	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	2065000
CY2019	us-gaap	Interest Paid Net InterestPaidNet	19976000
CY2018	us-gaap	Interest Paid Net InterestPaidNet	17783000
CY2020	olp	Operating Lease Liability Obtained In Exchange For Right Of Use Asset OperatingLeaseLiabilityObtainedInExchangeForRightOfUseAsset	2858000
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	11968000
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	16733000
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	14668000
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	13564000
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	11968000
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	16733000
CY2020	us-gaap	Interest Paid Net InterestPaidNet	20213000
CY2019	olp	Operating Lease Liability Obtained In Exchange For Right Of Use Asset OperatingLeaseLiabilityObtainedInExchangeForRightOfUseAsset	5027000
CY2020	us-gaap	Noncash Or Part Noncash Divestiture Amount Of Consideration Received1 NoncashOrPartNoncashDivestitureAmountOfConsiderationReceived1	4613000
CY2020	olp	Non Cash Investing Activities Purchase Accounting Allocation Intangible Lease Assets NonCashInvestingActivitiesPurchaseAccountingAllocationIntangibleLeaseAssets	3905000
CY2019	olp	Non Cash Investing Activities Purchase Accounting Allocation Intangible Lease Assets NonCashInvestingActivitiesPurchaseAccountingAllocationIntangibleLeaseAssets	4245000
CY2018	olp	Non Cash Investing Activities Purchase Accounting Allocation Intangible Lease Assets NonCashInvestingActivitiesPurchaseAccountingAllocationIntangibleLeaseAssets	4435000
CY2020	olp	Non Cash Investing Activities Purchase Accounting Allocation Intangible Lease Liabilities NonCashInvestingActivitiesPurchaseAccountingAllocationIntangibleLeaseLiabilities	-568000
CY2019	olp	Non Cash Investing Activities Purchase Accounting Allocation Intangible Lease Liabilities NonCashInvestingActivitiesPurchaseAccountingAllocationIntangibleLeaseLiabilities	-915000
CY2018	olp	Non Cash Investing Activities Purchase Accounting Allocation Intangible Lease Liabilities NonCashInvestingActivitiesPurchaseAccountingAllocationIntangibleLeaseLiabilities	-2508000
CY2020	us-gaap	Stock Issued1 StockIssued1	6828000
CY2020Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	12705000
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	11034000
CY2020Q4	olp	Restricted Cash Included In Escrow Deposits And Other Assets And Receivables RestrictedCashIncludedInEscrowDepositsAndOtherAssetsAndReceivables	859000
CY2019Q4	olp	Restricted Cash Included In Escrow Deposits And Other Assets And Receivables RestrictedCashIncludedInEscrowDepositsAndOtherAssetsAndReceivables	934000
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	13564000
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	11968000
CY2020	us-gaap	Nature Of Operations NatureOfOperations	<p style="font-family:'Times New Roman','Times','serif';font-size:10pt;font-weight:bold;margin:0pt 0pt 6pt 0pt;">NOTE 1—ORGANIZATION AND BACKGROUND</p><p style="font-family:'Times New Roman','Times','serif';font-size:10pt;text-indent:18pt;margin:0pt;">One Liberty Properties, Inc. (“OLP”) was incorporated in 1982 in Maryland. OLP is a self-administered and self-managed real estate investment trust (“REIT”). OLP acquires, owns and manages a geographically diversified portfolio consisting primarily of industrial, retail, restaurant, health and fitness, and theater properties, many of which are subject to long-term net leases. As of December 31, 2020, OLP owns 123 properties, including four properties owned by consolidated joint ventures and three properties owned by unconsolidated joint ventures. The 123 properties are located in 31 states.</p><p style="font-family:'Times New Roman','Times','serif';font-size:10pt;margin:0pt;"><span style="font-size:1pt;visibility:hidden;"></span></p>
CY2020Q4	us-gaap	Number Of Real Estate Properties NumberOfRealEstateProperties	123
CY2020Q4	us-gaap	Number Of Real Estate Properties NumberOfRealEstateProperties	123
CY2020Q4	us-gaap	Number Of States In Which Entity Operates NumberOfStatesInWhichEntityOperates	31
CY2020Q4	olp	Unconsolidated Joint Venture Variable Interest Entity Number Of Entities UnconsolidatedJointVentureVariableInterestEntityNumberOfEntities	0
CY2020Q4	olp	Joint Venture Recourse Debt JointVentureRecourseDebt	0
CY2020	us-gaap	Impairment Of Investments ImpairmentOfInvestments	0
CY2019	us-gaap	Amortization Of Above And Below Market Leases AmortizationOfAboveAndBelowMarketLeases	-914000
CY2018	us-gaap	Amortization Of Above And Below Market Leases AmortizationOfAboveAndBelowMarketLeases	-1849000
CY2020	olp	Deferred Lease Income Rent Concessions DeferredLeaseIncomeRentConcessions	3505000
CY2020	olp	Write Off Of Operating Lease Payments To Be Received WriteOffOfOperatingLeasePaymentsToBeReceived	184000
CY2020	olp	Write Off Of Operating Lease Payments Due To Lease Modification Accounting WriteOffOfOperatingLeasePaymentsDueToLeaseModificationAccounting	1187000
CY2020	olp	Repayments Of Covid19 Related Deferred Rent RepaymentsOfCovid19RelatedDeferredRent	497000
CY2020	us-gaap	Use Of Estimates UseOfEstimates	<p style="font-family:'Times New Roman','Times','serif';font-size:10pt;font-style:italic;font-weight:bold;margin:0pt 0pt 6pt 0pt;">Use of Estimates</p><p style="font-family:'Times New Roman','Times','serif';font-size:10pt;text-indent:18pt;margin:0pt 0pt 6pt 0pt;">The preparation of the consolidated financial statements in conformity with U.S. generally accepted accounting principles (“GAAP”) requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. Actual results could differ from those estimates.</p><p style="font-family:'Times New Roman','Times','serif';font-size:10pt;text-indent:18pt;margin:0pt 0pt 12pt 0pt;"><span style="white-space:pre-wrap;">Management believes that the estimates and assumptions that are most important to the portrayal of the Company’s consolidated financial condition and results of operations, in that they require management’s most difficult, subjective or complex judgments, form the basis of the accounting policies deemed to be most significant to the Company. These significant accounting policies relate to revenues and the value of the Company’s real estate portfolio, including investments in unconsolidated joint ventures. Management believes its estimates and assumptions related to these significant accounting policies are appropriate under the circumstances; however, should future events or occurrences result in unanticipated consequences, there could be a material impact on the Company’s future consolidated financial condition or results of operations.</span></p>
CY2020Q4	olp	Real Estate Taxes Insurance And Other Escrows RealEstateTaxesInsuranceAndOtherEscrows	859000
CY2019Q4	olp	Real Estate Taxes Insurance And Other Escrows RealEstateTaxesInsuranceAndOtherEscrows	934000
CY2020	us-gaap	Depreciation And Amortization DepreciationAndAmortization	22964000
CY2019	us-gaap	Depreciation And Amortization DepreciationAndAmortization	22026000
CY2018	us-gaap	Depreciation And Amortization DepreciationAndAmortization	24155000
CY2020Q4	us-gaap	Accumulated Amortization Deferred Finance Costs AccumulatedAmortizationDeferredFinanceCosts	4599000
CY2019Q4	us-gaap	Accumulated Amortization Deferred Finance Costs AccumulatedAmortizationDeferredFinanceCosts	3799000
CY2020	us-gaap	Concentration Risk Credit Risk ConcentrationRiskCreditRisk	<p style="font-family:'Times New Roman','Times','serif';font-size:10pt;font-style:italic;font-weight:bold;margin:0pt 0pt 6pt 0pt;">Concentration of Credit Risk</p><p style="font-family:'Times New Roman','Times','serif';font-size:10pt;text-indent:18pt;margin:0pt 0pt 6pt 0pt;">The Company maintains cash accounts at various financial institutions. While the Company attempts to limit any financial exposure, substantially all of its deposit balances exceed federally insured limits. The Company has not experienced any losses on such accounts.</p><p style="font-family:'Times New Roman','Times','serif';font-size:10pt;text-indent:18pt;margin:0pt 0pt 6pt 0pt;">The Company’s properties are located in 31 states. No real estate investments in any one state contributed more than 10% to the Company’s total revenues in any of the past three years.</p><p style="font-family:'Times New Roman','Times','serif';font-size:10pt;text-indent:18pt;margin:0pt 0pt 11pt 0pt;">No tenant contributed over 10% to the Company’s total revenues during 2020, 2019 and 2018.</p>
CY2020	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	1
CY2018	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	684000
CY2020	us-gaap	Operating Lease Lease Income Lease Payments OperatingLeaseLeaseIncomeLeasePayments	69823000
CY2019	us-gaap	Operating Lease Lease Income Lease Payments OperatingLeaseLeaseIncomeLeasePayments	70788000
CY2018	us-gaap	Operating Lease Lease Income Lease Payments OperatingLeaseLeaseIncomeLeasePayments	65042000
CY2020	us-gaap	Operating Lease Variable Lease Income OperatingLeaseVariableLeaseIncome	11285000
CY2019	us-gaap	Operating Lease Variable Lease Income OperatingLeaseVariableLeaseIncome	12084000
CY2018	us-gaap	Operating Lease Variable Lease Income OperatingLeaseVariableLeaseIncome	11863000
CY2020	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	81108000
CY2019	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	82872000
CY2018	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	76905000
CY2020	us-gaap	Amortization Of Above And Below Market Leases AmortizationOfAboveAndBelowMarketLeases	-780000
CY2021Q1	olp	Repayments Of Covid19 Related Deferred Rent RepaymentsOfCovid19RelatedDeferredRent	529000
CY2020Q4	olp	Operating Lease Income Uncollectible OperatingLeaseIncomeUncollectible	928000
CY2020Q4	us-gaap	Lessor Operating Lease Payments To Be Received Next Twelve Months LessorOperatingLeasePaymentsToBeReceivedNextTwelveMonths	70637000
CY2020Q4	us-gaap	Lessor Operating Lease Payments To Be Received Two Years LessorOperatingLeasePaymentsToBeReceivedTwoYears	62167000
CY2020Q4	us-gaap	Lessor Operating Lease Payments To Be Received Three Years LessorOperatingLeasePaymentsToBeReceivedThreeYears	53248000
CY2020Q4	us-gaap	Lessor Operating Lease Payments To Be Received Four Years LessorOperatingLeasePaymentsToBeReceivedFourYears	44469000
CY2020Q4	us-gaap	Lessor Operating Lease Payments To Be Received Five Years LessorOperatingLeasePaymentsToBeReceivedFiveYears	40243000
CY2020Q4	us-gaap	Lessor Operating Lease Payments To Be Received Thereafter LessorOperatingLeasePaymentsToBeReceivedThereafter	163148000
CY2020Q4	us-gaap	Lessor Operating Lease Payments To Be Received LessorOperatingLeasePaymentsToBeReceived	433912000
CY2020	olp	Payments Received Upon Early Lease Termination PaymentsReceivedUponEarlyLeaseTermination	88000
CY2019	olp	Payments Received Upon Early Lease Termination PaymentsReceivedUponEarlyLeaseTermination	950000
CY2019	olp	Number Of Retail Tenants In Lease Buy Out Transactions NumberOfRetailTenantsInLeaseBuyOutTransactions	2
CY2019	olp	Write Off Of Unbilled Rent Receivable WriteOffOfUnbilledRentReceivable	37000
CY2018	olp	Payments Received Upon Early Lease Termination PaymentsReceivedUponEarlyLeaseTermination	372000
CY2020Q4	us-gaap	Deferred Rent Receivables Net DeferredRentReceivablesNet	15438000
CY2019Q4	us-gaap	Deferred Rent Receivables Net DeferredRentReceivablesNet	15037000
CY2020	olp	Deferred Rent Receivable Period During Which Amount Of Rent To Be Billed And Received DeferredRentReceivablePeriodDuringWhichAmountOfRentToBeBilledAndReceived	P15Y
CY2020	olp	Straight Line Rent Receivable Written Off Relating To Property Sold StraightLineRentReceivableWrittenOffRelatingToPropertySold	365000
CY2019	olp	Straight Line Rent Receivable Written Off Relating To Property Sold StraightLineRentReceivableWrittenOffRelatingToPropertySold	182000
CY2018	olp	Straight Line Rent Receivable Written Off Relating To Property Sold StraightLineRentReceivableWrittenOffRelatingToPropertySold	45000
CY2020Q4	olp	Deferred Rent Payables DeferredRentPayables	801000
CY2019Q4	olp	Deferred Rent Payables DeferredRentPayables	662000
CY2020	olp	Deferred Rent Payables Period During Which Amount Of Rent To Be Billed And Payables DeferredRentPayablesPeriodDuringWhichAmountOfRentToBeBilledAndPayables	P21Y
CY2020	olp	Unbilled Rent Receivable Written Off Where Collectability Is Less Than Probable UnbilledRentReceivableWrittenOffWhereCollectabilityIsLessThanProbable	1094000
CY2019	olp	Straight Line Rent Receivable Written Off Relating To Tenant Filing Bankruptcy Or Going Concern Issues StraightLineRentReceivableWrittenOffRelatingToTenantFilingBankruptcyOrGoingConcernIssues	548000
CY2018	olp	Straight Line Rent Receivable Written Off Relating To Tenant Filing Bankruptcy Or Going Concern Issues StraightLineRentReceivableWrittenOffRelatingToTenantFilingBankruptcyOrGoingConcernIssues	1440000
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	511000
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	506000
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	507000
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	557000
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	626000
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	6847000
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	9554000
CY2020Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	2057000
CY2020Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	7497000
CY2020	olp	Payments To Acquire Real Estate Excluding Acquisition Costs PaymentsToAcquireRealEstateExcludingAcquisitionCosts	28250000
CY2020Q4	olp	Real Estate Acquisition Cost Capitalized RealEstateAcquisitionCostCapitalized	254000
CY2019	olp	Payments To Acquire Real Estate Excluding Acquisition Costs PaymentsToAcquireRealEstateExcludingAcquisitionCosts	49250000
CY2019Q4	olp	Real Estate Acquisition Cost Capitalized RealEstateAcquisitionCostCapitalized	637000
CY2020	us-gaap	Mortgage Loans On Real Estate New Mortgage Loans MortgageLoansOnRealEstateNewMortgageLoans	18200000
CY2019	us-gaap	Mortgage Loans On Real Estate New Mortgage Loans MortgageLoansOnRealEstateNewMortgageLoans	50310000
CY2020Q4	us-gaap	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Land BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand	2078000
CY2020Q4	olp	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Buildings And Improvements BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildingsAndImprovements	23089000
CY2020Q4	us-gaap	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Intangibles BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles	3905000
CY2020Q4	olp	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Intangible Lease Liability BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleLeaseLiability	568000
CY2020Q4	us-gaap	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Net BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet	28504000
CY2019Q4	us-gaap	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Land BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand	7461000
CY2019Q4	olp	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Buildings And Improvements BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildingsAndImprovements	39096000
CY2019Q4	us-gaap	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Intangibles BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles	4245000
CY2019Q4	olp	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Intangible Lease Liability BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleLeaseLiability	915000
CY2019Q4	us-gaap	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Net BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet	49887000
CY2020	us-gaap	Acquired Finite Lived Intangible Assets Weighted Average Useful Life AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife	P8Y3M18D
CY2020	olp	Acquired Finite Lived Intangible Liabilities Weighted Average Amortization Period AcquiredFiniteLivedIntangibleLiabilitiesWeightedAverageAmortizationPeriod	P13Y8M12D
CY2019	us-gaap	Acquired Finite Lived Intangible Assets Weighted Average Useful Life AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife	P7Y7M6D
CY2019	olp	Acquired Finite Lived Intangible Liabilities Weighted Average Amortization Period AcquiredFiniteLivedIntangibleLiabilitiesWeightedAverageAmortizationPeriod	P9Y9M18D
CY2020Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	24530000
CY2019Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	19904000
CY2020Q4	us-gaap	Below Market Lease Accumulated Amortization BelowMarketLeaseAccumulatedAmortization	8539000
CY2019Q4	us-gaap	Below Market Lease Accumulated Amortization BelowMarketLeaseAccumulatedAmortization	7502000
CY2020	us-gaap	Amortization Of Above And Below Market Leases AmortizationOfAboveAndBelowMarketLeases	-780000
CY2019	us-gaap	Amortization Of Above And Below Market Leases AmortizationOfAboveAndBelowMarketLeases	-914000
CY2018	us-gaap	Amortization Of Above And Below Market Leases AmortizationOfAboveAndBelowMarketLeases	-1849000
CY2020	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	4617000
CY2019	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	4039000
CY2018	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	7175000
CY2018	olp	Write Off Of Tenant Origination Costs WriteOffOfTenantOriginationCosts	2743000
CY2020	olp	Gross Proceeds From Sale Of Real Estate GrossProceedsFromSaleOfRealEstate	34340000
CY2020	us-gaap	Gain Loss On Sale Of Properties GainLossOnSaleOfProperties	17280000
CY2020	olp	Mortgages Prepaid On Sale Of Property MortgagesPrepaidOnSaleOfProperty	11815000
CY2020	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-1123000
CY2019	olp	Gross Proceeds From Sale Of Real Estate GrossProceedsFromSaleOfRealEstate	41891000
CY2019	us-gaap	Gain Loss On Sale Of Properties GainLossOnSaleOfProperties	4327000
CY2019	olp	Mortgages Prepaid On Sale Of Property MortgagesPrepaidOnSaleOfProperty	17507000
CY2019	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-827000
CY2018	olp	Gross Proceeds From Sale Of Real Estate GrossProceedsFromSaleOfRealEstate	27659000
CY2018	us-gaap	Gain Loss On Sale Of Properties GainLossOnSaleOfProperties	5262000
CY2018	olp	Mortgages Prepaid On Sale Of Property MortgagesPrepaidOnSaleOfProperty	4423000
CY2020	us-gaap	Profit Loss ProfitLoss	27413000
CY2019	us-gaap	Profit Loss ProfitLoss	18544000
CY2018	us-gaap	Profit Loss ProfitLoss	21564000
CY2020	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	6000
CY2019	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	533000
CY2018	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	899000
CY2020	us-gaap	Participating Securities Distributed And Undistributed Earnings Loss Basic ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic	1263000
CY2019	us-gaap	Participating Securities Distributed And Undistributed Earnings Loss Basic ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic	1227000
CY2018	us-gaap	Participating Securities Distributed And Undistributed Earnings Loss Basic ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic	1173000
CY2020	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	26144000
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	16784000
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	19492000
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	19571000
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	19090000
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	18575000
CY2020	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	28000
CY2019	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	29000
CY2018	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	13000
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	19599000
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	19119000
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	18588000
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.34
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.88
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.05
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.33
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.88
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.05
CY2018Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	0
CY2019Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	0
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	0
CY2018	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.80
CY2019	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.80
CY2020Q1	us-gaap	Dividends Common Stock DividendsCommonStock	9037000
CY2020Q2	olp	Dividends Declared Common Stock Percentage Paid In Cash DividendsDeclaredCommonStockPercentagePaidInCash	1.000
CY2020Q2	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	9037000
CY2020Q2	us-gaap	Dividends Common Stock DividendsCommonStock	9068000
CY2020Q3	olp	Dividends Declared Common Stock Percentage Paid In Cash DividendsDeclaredCommonStockPercentagePaidInCash	0.500
CY2020Q3	olp	Dividends Declared Common Stock Percentage Paid In Stock DividendsDeclaredCommonStockPercentagePaidInStock	0.500
CY2020Q3	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	4537000
CY2020Q3	us-gaap	Common Stock Dividends Shares CommonStockDividendsShares	263000
CY2020Q3	us-gaap	Dividends Common Stock DividendsCommonStock	9198000
CY2020Q4	olp	Dividends Declared Common Stock Percentage Paid In Cash DividendsDeclaredCommonStockPercentagePaidInCash	0.750
CY2020Q4	olp	Dividends Declared Common Stock Percentage Paid In Stock DividendsDeclaredCommonStockPercentagePaidInStock	0.250
CY2020Q4	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	6901000
CY2020Q4	us-gaap	Common Stock Dividends Shares CommonStockDividendsShares	141000
CY2020Q4	us-gaap	Dividends Common Stock DividendsCommonStock	9261000
CY2021Q1	olp	Dividends Declared Common Stock Percentage Paid In Cash DividendsDeclaredCommonStockPercentagePaidInCash	1.000
CY2021Q1	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	9261000
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.45
CY2021Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.45
CY2021Q1	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	9330000
CY2020Q3	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	25000000
CY2020Q3	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	50000000
CY2020	us-gaap	Stock Issued During Period Shares Dividend Reinvestment Plan StockIssuedDuringPeriodSharesDividendReinvestmentPlan	77000
CY2019	us-gaap	Stock Issued During Period Shares Dividend Reinvestment Plan StockIssuedDuringPeriodSharesDividendReinvestmentPlan	220000
CY2018	us-gaap	Stock Issued During Period Shares Dividend Reinvestment Plan StockIssuedDuringPeriodSharesDividendReinvestmentPlan	243000
CY2019	us-gaap	Stock Issued During Period Shares New Issues StockIssuedDuringPeriodSharesNewIssues	180120
CY2019	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	5392000
CY2019	olp	Payment Of Commissions On Sale Of Shares PaymentOfCommissionsOnSaleOfShares	54000
CY2019	olp	Payment Of Offering Costs On Sale Of Shares PaymentOfOfferingCostsOnSaleOfShares	192000
CY2018	us-gaap	Stock Issued During Period Shares New Issues StockIssuedDuringPeriodSharesNewIssues	126300
CY2018	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	3245000
CY2018	olp	Payment Of Commissions On Sale Of Shares PaymentOfCommissionsOnSaleOfShares	33000
CY2018	olp	Payment Of Offering Costs On Sale Of Shares PaymentOfOfferingCostsOnSaleOfShares	107000
CY2020	us-gaap	Operating Lease Payments OperatingLeasePayments	463867
CY2020	olp	Common Stock Dividends Cash Paid Capital Gain Percentage CommonStockDividendsCashPaidCapitalGainPercentage	0.47
CY2020	olp	Percentage Of Distributions Representing Return Of Capital To Shareholders PercentageOfDistributionsRepresentingReturnOfCapitalToShareholders	0.08
CY2019	olp	Percentage Of Distributions Representing Return Of Capital To Shareholders PercentageOfDistributionsRepresentingReturnOfCapitalToShareholders	0.27
CY2018	olp	Common Stock Dividends Cash Paid Capital Gain Percentage CommonStockDividendsCashPaidCapitalGainPercentage	0.12
CY2020	olp	Dividends Declared Reconciliation DividendsDeclaredReconciliation	36564000
CY2019	olp	Dividends Declared Reconciliation DividendsDeclaredReconciliation	35663000
CY2018	olp	Dividends Declared Reconciliation DividendsDeclaredReconciliation	34652000
CY2020	olp	Dividend Reinvestment Plan Common Stock Discount On Shares DividendReinvestmentPlanCommonStockDiscountOnShares	47000
CY2019	olp	Dividend Reinvestment Plan Common Stock Discount On Shares DividendReinvestmentPlanCommonStockDiscountOnShares	247000
CY2018	olp	Dividend Reinvestment Plan Common Stock Discount On Shares DividendReinvestmentPlanCommonStockDiscountOnShares	313000
CY2020	olp	Dividends Before Adjustments For Previous And Current Year DividendsBeforeAdjustmentsForPreviousAndCurrentYear	36611000
CY2019	olp	Dividends Before Adjustments For Previous And Current Year DividendsBeforeAdjustmentsForPreviousAndCurrentYear	35910000
CY2018	olp	Dividends Before Adjustments For Previous And Current Year DividendsBeforeAdjustmentsForPreviousAndCurrentYear	34965000
CY2018	olp	Dividends Designated To Previous Year DividendsDesignatedToPreviousYear	10263000
CY2020	olp	Dividends Designated To Following Year DividendsDesignatedToFollowingYear	9261000
CY2019	olp	Dividends Designated To Following Year DividendsDesignatedToFollowingYear	8976000
CY2018	olp	Dividends Designated To Following Year DividendsDesignatedToFollowingYear	549000
CY2020	olp	Return Of Capital ReturnOfCapital	3273000
CY2019	olp	Return Of Capital ReturnOfCapital	9842000
CY2020	olp	Dividends Designated From Prior Year DividendsDesignatedFromPriorYear	8976000
CY2019	olp	Dividends Designated From Prior Year DividendsDesignatedFromPriorYear	549000
CY2020	olp	Dividend Paid Deduction From Taxable Income DividendPaidDeductionFromTaxableIncome	33053000
CY2019	olp	Dividend Paid Deduction From Taxable Income DividendPaidDeductionFromTaxableIncome	17641000
CY2018	olp	Dividend Paid Deduction From Taxable Income DividendPaidDeductionFromTaxableIncome	24153000
CY2020Q1	us-gaap	Revenues Revenues	21239000
CY2020Q2	us-gaap	Revenues Revenues	20861000
CY2020Q3	us-gaap	Revenues Revenues	21071000
CY2020Q4	us-gaap	Revenues Revenues	18732000
CY2020	us-gaap	Revenues Revenues	81903000
CY2020Q1	us-gaap	Gains Losses On Sales Of Investment Real Estate GainsLossesOnSalesOfInvestmentRealEstate	4252000
CY2020Q3	us-gaap	Gains Losses On Sales Of Investment Real Estate GainsLossesOnSalesOfInvestmentRealEstate	10316000
CY2020Q4	us-gaap	Gains Losses On Sales Of Investment Real Estate GainsLossesOnSalesOfInvestmentRealEstate	2712000
CY2020	us-gaap	Gains Losses On Sales Of Investment Real Estate GainsLossesOnSalesOfInvestmentRealEstate	17280000
CY2020Q1	us-gaap	Profit Loss ProfitLoss	7831000
CY2020Q2	us-gaap	Profit Loss ProfitLoss	2285000
CY2020Q3	us-gaap	Profit Loss ProfitLoss	13726000
CY2020Q4	us-gaap	Profit Loss ProfitLoss	3571000
CY2020	us-gaap	Profit Loss ProfitLoss	27413000
CY2020Q1	us-gaap	Net Income Loss NetIncomeLoss	7826000
CY2020Q2	us-gaap	Net Income Loss NetIncomeLoss	2284000
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	13725000
CY2020Q4	us-gaap	Net Income Loss NetIncomeLoss	3572000
CY2020	us-gaap	Net Income Loss NetIncomeLoss	27407000
CY2020Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	19361000
CY2020Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	19445000
CY2020Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	19640000
CY2020Q4	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	19835000
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	19571000
CY2020Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	19374000
CY2020Q2	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	19505000
CY2020Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	19686000
CY2020Q4	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	19871000
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	19599000
CY2020Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.39
CY2020Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.10
CY2020Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.67
CY2020Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.16
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.34
CY2020Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.39
CY2020Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.10
CY2020Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.67
CY2020Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.16
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.33
CY2019Q1	us-gaap	Revenues Revenues	21155000
CY2019Q2	us-gaap	Revenues Revenues	20719000
CY2019Q3	us-gaap	Revenues Revenues	20414000
CY2019Q4	us-gaap	Revenues Revenues	22448000
CY2019	us-gaap	Revenues Revenues	84736000
CY2019Q2	us-gaap	Gains Losses On Sales Of Investment Real Estate GainsLossesOnSalesOfInvestmentRealEstate	1099000
CY2019Q3	us-gaap	Gains Losses On Sales Of Investment Real Estate GainsLossesOnSalesOfInvestmentRealEstate	2544000
CY2019Q4	us-gaap	Gains Losses On Sales Of Investment Real Estate GainsLossesOnSalesOfInvestmentRealEstate	684000
CY2019Q2	us-gaap	Net Income Loss NetIncomeLoss	4112000
CY2019	us-gaap	Gains Losses On Sales Of Investment Real Estate GainsLossesOnSalesOfInvestmentRealEstate	4327000
CY2019Q1	us-gaap	Profit Loss ProfitLoss	4011000
CY2019Q2	us-gaap	Profit Loss ProfitLoss	4558000
CY2019Q3	us-gaap	Profit Loss ProfitLoss	5097000
CY2019Q4	us-gaap	Profit Loss ProfitLoss	4878000
CY2019	us-gaap	Profit Loss ProfitLoss	18544000
CY2019Q1	us-gaap	Net Income Loss NetIncomeLoss	3971000
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	5118000
CY2019Q4	us-gaap	Net Income Loss NetIncomeLoss	4810000
CY2019	us-gaap	Net Income Loss NetIncomeLoss	18011000
CY2019Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	18894000
CY2019Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	19023000
CY2019Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	19191000
CY2019Q4	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	19245000
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	19090000
CY2019Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	18993000
CY2019Q2	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	19129000
CY2019Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	19239000
CY2019Q4	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	19266000
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	19119000
CY2019Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.19
CY2019Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.20
CY2019Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.25
CY2019Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.23
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.88
CY2019Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.19
CY2019Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.20
CY2019Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.25
CY2019Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.23
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.88
CY2020Q4	srt	Real Estate And Accumulated Depreciation Amount Of Encumbrances RealEstateAndAccumulatedDepreciationAmountOfEncumbrances	433549000
CY2020Q4	us-gaap	Real Estate And Accumulated Depreciation Initial Cost Of Land RealEstateAndAccumulatedDepreciationInitialCostOfLand	190391000
CY2020Q4	us-gaap	Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements	609545000
CY2020Q4	us-gaap	Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements	39122000
CY2020Q4	us-gaap	Real Estate And Accumulated Depreciation Carrying Amount Of Land RealEstateAndAccumulatedDepreciationCarryingAmountOfLand	190391000
CY2020Q4	us-gaap	Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements	648667000
CY2020Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	839058000
CY2020Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	147136000
CY2019Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	835837000
CY2018Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	829143000
CY2017Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	775327000
CY2020	us-gaap	Real Estate Other Acquisitions RealEstateOtherAcquisitions	26444000
CY2019	us-gaap	Real Estate Other Acquisitions RealEstateOtherAcquisitions	49669000
CY2018	us-gaap	Real Estate Other Acquisitions RealEstateOtherAcquisitions	86117000
CY2020	us-gaap	Real Estate Cost Of Real Estate Sold RealEstateCostOfRealEstateSold	22441000
CY2019	us-gaap	Real Estate Cost Of Real Estate Sold RealEstateCostOfRealEstateSold	42975000
CY2018	us-gaap	Real Estate Cost Of Real Estate Sold RealEstateCostOfRealEstateSold	32301000
CY2020	us-gaap	Real Estate Other Deductions RealEstateOtherDeductions	782000
CY2020Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	839058000
CY2019Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	835837000
CY2018Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	829143000
CY2019Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	135302000
CY2018Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	123684000
CY2017Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	108953000
CY2020	us-gaap	Sec Schedule Iii Real Estate Accumulated Depreciation Depreciation Expense SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpense	17941000
CY2019	us-gaap	Sec Schedule Iii Real Estate Accumulated Depreciation Depreciation Expense SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpense	17534000
CY2018	us-gaap	Sec Schedule Iii Real Estate Accumulated Depreciation Depreciation Expense SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpense	16615000
CY2020	us-gaap	Real Estate Accumulated Depreciation Other Deductions RealEstateAccumulatedDepreciationOtherDeductions	352000
CY2020	us-gaap	Real Estate Accumulated Depreciation Real Estate Sold RealEstateAccumulatedDepreciationRealEstateSold	5755000
CY2019	us-gaap	Real Estate Accumulated Depreciation Real Estate Sold RealEstateAccumulatedDepreciationRealEstateSold	5916000
CY2018	us-gaap	Real Estate Accumulated Depreciation Real Estate Sold RealEstateAccumulatedDepreciationRealEstateSold	1884000
CY2020Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	147136000
CY2019Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	135302000
CY2018Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	123684000
CY2020Q4	olp	Real Estate Federal Income Tax Basis Difference Amount RealEstateFederalIncomeTaxBasisDifferenceAmount	19599000

Files In Submission

Name	View Source	Status
0001558370-21-002931-index-headers.html	Edgar Link	pending
0001558370-21-002931-index.html	Edgar Link	pending
0001558370-21-002931.txt	Edgar Link	pending
0001558370-21-002931-xbrl.zip	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xlsx	Edgar Link	pending
MetaLinks.json	Edgar Link	pending
olp-20201231.xsd	Edgar Link	pending
olp-20201231x10k.htm	Edgar Link	pending
olp-20201231x10k_htm.xml	Edgar Link	completed
olp-20201231xex10d4.htm	Edgar Link	pending
olp-20201231xex21d1.htm	Edgar Link	pending
olp-20201231xex23d1.htm	Edgar Link	pending
olp-20201231xex31d1.htm	Edgar Link	pending
olp-20201231xex31d2.htm	Edgar Link	pending
olp-20201231xex32d1.htm	Edgar Link	pending
olp-20201231xex32d2.htm	Edgar Link	pending
olp-20201231xex3d1.htm	Edgar Link	pending
olp-20201231xex4d5.htm	Edgar Link	pending
olp-20201231_cal.xml	Edgar Link	unprocessable
olp-20201231_def.xml	Edgar Link	unprocessable
olp-20201231_lab.xml	Edgar Link	unprocessable
olp-20201231_pre.xml	Edgar Link	unprocessable
R1.htm	Edgar Link	pending
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report.css	Edgar Link	pending
Show.js	Edgar Link	pending

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$OLP
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2020 Q4 Form 10-K Financial Statement

#000155837021002931 Filed on March 12, 2021

Income Statement

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Facts In Submission

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$OLP ONE LIBERTY PROPERTIES INC Stock $olp

2020 Q4 Form 10-K Financial Statement

#000155837021002931 Filed on March 12, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$OLP
ONE LIBERTY PROPERTIES INC Stock $olp