$OTTR
Otter Tail Corp Stock $ottr

$ottr Overview Financials Valuation SEC Filings Company Website

2021 Q2 Form 10-Q Financial Statement

#000146659321000056 Filed on August 06, 2021

Income Statement

Concept	2021 Q2	2020 Q2	2020 Q1
Revenue	$285.6M	$192.8M	$234.7M
YoY Change	48.17%	-15.9%	-4.56%
Cost Of Revenue	$133.7M	$87.50M	$104.7M
YoY Change	52.81%	-25.6%	-6.93%
Gross Profit	$151.9M	$105.3M	$130.0M
YoY Change	44.25%	-5.65%	-2.62%
Gross Profit Margin	53.18%	54.63%	55.38%
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$23.17M	$20.44M	$20.40M
YoY Change	13.37%	5.12%	6.63%
% of Gross Profit	15.25%	19.41%	15.69%
Operating Expenses	$92.07M	$77.30M	$90.80M
YoY Change	19.11%	-8.84%	-3.3%
Operating Profit	$59.82M	$27.91M	$39.29M
YoY Change	114.35%	4.06%	-0.71%
Interest Expense	-$9.555M	-$8.700M	-$8.100M
YoY Change	9.83%	11.54%	3.85%
% of Operating Profit	-15.97%	-31.17%	-20.62%
Other Income/Expense, Net	$734.0K	$2.410M	-$389.0K
YoY Change	-69.54%	183.53%	-131.27%
Pretax Income	$50.38M	$20.79M	$29.91M
YoY Change	142.33%	10.76%	-6.4%
Income Tax	$8.308M	$3.808M	$5.638M
% Of Pretax Income	16.49%	18.32%	18.85%
Net Earnings	$42.07M	$16.98M	$24.27M
YoY Change	147.74%	10.08%	-7.81%
Net Earnings / Revenue	14.73%	8.81%	10.34%
Basic Earnings Per Share	$1.01	$0.42	$0.60
Diluted Earnings Per Share	$1.01	$0.42	$0.60
COMMON SHARES
Basic Shares Outstanding	41.50M shares	40.51M shares	40.22M shares
Diluted Shares Outstanding	41.82M shares	40.68M shares	40.44M shares

Balance Sheet

Concept	2021 Q2	2020 Q2	2020 Q1
SHORT-TERM ASSETS
Cash & Short-Term Investments	$1.480M	$39.50M	$7.900M
YoY Change	-96.25%	3850.0%	777.78%
Cash & Equivalents	$1.480M	$39.51M	$7.884M
Short-Term Investments
Other Short-Term Assets	$13.72M	$8.031M	$7.347M
YoY Change	70.88%	-5.64%	-26.43%
Inventory	$103.0M	$89.75M	$98.15M
Prepaid Expenses
Receivables	$133.0M	$84.20M	$96.16M
Other Receivables	$12.25M	$6.452M	$7.228M
Total Short-Term Assets	$304.9M	$266.9M	$256.2M
YoY Change	14.23%	1.27%	-6.4%
LONG-TERM ASSETS
Property, Plant & Equipment	$2.073B	$1.862B	$1.789B
YoY Change	11.35%	16.2%	13.32%
Goodwill	$37.57M	$37.57M	$37.57M
YoY Change	0.0%	0.0%	0.0%
Intangibles	$9.594M	$10.70M	$10.99M
YoY Change	-10.36%	-9.74%	-9.55%
Long-Term Investments	$55.81M	$10.60M	$9.500M
YoY Change	426.5%	9.28%	3.26%
Other Assets	$30.68M	$40.14M	$38.25M
YoY Change	-23.55%	2.91%	-1.04%
Total Long-Term Assets	$2.367B	$2.122B	$2.050B
YoY Change	11.51%	14.63%	11.96%
TOTAL ASSETS
Total Short-Term Assets	$304.9M	$266.9M	$256.2M
Total Long-Term Assets	$2.367B	$2.122B	$2.050B
Total Assets	$2.672B	$2.389B	$2.306B
YoY Change	11.82%	12.97%	9.57%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$131.2M	$134.0M	$99.50M
YoY Change	-2.05%	19.78%	-0.99%
Accrued Expenses	$23.78M	$32.20M	$28.00M
YoY Change	-26.16%	-2.72%	1.45%
Deferred Revenue
YoY Change
Short-Term Debt	$128.0M	$41.24M	$19.89M
YoY Change	210.28%	12.67%	-54.37%
Long-Term Debt Due	$140.0M	$261.0K	$306.0K
YoY Change	53525.67%	47.46%	75.86%
Total Short-Term Liabilities	$483.5M	$232.9M	$175.7M
YoY Change	107.57%	12.99%	-12.47%
LONG-TERM LIABILITIES
Long-Term Debt	$624.5M	$724.4M	$724.3M
YoY Change	-13.78%	22.76%	22.76%
Other Long-Term Liabilities	$62.16M	$34.65M	$30.91M
YoY Change	79.41%	20.06%	17.3%
Total Long-Term Liabilities	$648.4M	$759.0M	$755.2M
YoY Change	-14.57%	22.64%	22.53%
TOTAL LIABILITIES
Total Short-Term Liabilities	$483.5M	$232.9M	$175.7M
Total Long-Term Liabilities	$648.4M	$759.0M	$755.2M
Total Liabilities	$1.132B	$992.0M	$930.9M
YoY Change	14.11%	20.23%	13.93%
SHAREHOLDERS EQUITY
Retained Earnings	$297.9M	$233.7M	$231.7M
YoY Change	27.45%	13.94%	13.79%
Common Stock	$625.6M	$594.4M	$574.6M
YoY Change	5.25%	9.3%	6.08%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$915.1M	$822.1M	$800.0M
YoY Change
Total Liabilities & Shareholders Equity	$2.672B	$2.389B	$2.306B
YoY Change	11.82%	12.97%	9.57%

Cashflow Statement

Concept	2021 Q2	2020 Q2	2020 Q1
OPERATING ACTIVITIES
Net Income	$42.07M	$16.98M	$24.27M
YoY Change	147.74%	10.08%	-7.81%
Depreciation, Depletion And Amortization	$23.17M	$20.44M	$20.40M
YoY Change	13.37%	5.12%	6.63%
Cash From Operating Activities	$53.27M	$52.10M	$21.78M
YoY Change	2.25%	0.0%	26.98%
INVESTING ACTIVITIES
Capital Expenditures	-$26.79M	-$44.70M	-$75.10M
YoY Change	-40.06%	52.56%	204.05%
Acquisitions
YoY Change
Other Investing Activities	-$612.0K	-$1.200M	$0.00
YoY Change	-49.0%	71.43%	-100.0%
Cash From Investing Activities	-$27.40M	-$45.90M	-$75.06M
YoY Change	-40.3%	53.0%	195.09%
FINANCING ACTIVITIES
Cash Dividend Paid			$14.91M
YoY Change			7.08%
Common Stock Issuance & Retirement, Net			-$6.327M
YoY Change			-331.76%
Debt Paid & Issued, Net			$45.00K
YoY Change			7.14%
Cash From Financing Activities	-25.65M	25.40M	$39.97M
YoY Change	-201.0%	-214.93%	380.6%
NET CHANGE
Cash From Operating Activities	53.27M	52.10M	$21.78M
Cash From Investing Activities	-27.40M	-45.90M	-$75.06M
Cash From Financing Activities	-25.65M	25.40M	$39.97M
Net Change In Cash	217.0K	31.60M	-$13.32M
YoY Change	-99.31%	-424128020480000200.0%	-44483.33%
FREE CASH FLOW
Cash From Operating Activities	$53.27M	$52.10M	$21.78M
Capital Expenditures	-$26.79M	-$44.70M	-$75.10M
Free Cash Flow	$80.07M	$96.80M	$96.88M
YoY Change	-17.29%	18.92%	131.49%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
	dei	Entity Central Index Key EntityCentralIndexKey	0001466593
	dei	Amendment Flag AmendmentFlag	false
	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q2
	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2021
	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
	dei	Document Type DocumentType	10-Q
	dei	Document Quarterly Report DocumentQuarterlyReport	true
	dei	Document Period End Date DocumentPeriodEndDate	2021-06-30
	dei	Document Transition Report DocumentTransitionReport	false
	dei	Entity File Number EntityFileNumber	0-53713
	dei	Entity Registrant Name EntityRegistrantName	OTTER TAIL CORPORATION
	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	MN
	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	27-0383995
	dei	Entity Address Address Line1 EntityAddressAddressLine1	215 South Cascade Street
	dei	Entity Address Address Line2 EntityAddressAddressLine2	Box 496
	dei	Entity Address City Or Town EntityAddressCityOrTown	Fergus Falls
	dei	Entity Address State Or Province EntityAddressStateOrProvince	MN
	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	56538-0496
	dei	City Area Code CityAreaCode	866
	dei	Local Phone Number LocalPhoneNumber	410-8780
	dei	Security12b Title Security12bTitle	Common Shares, par value $5.00 per share
	dei	Trading Symbol TradingSymbol	OTTR
	dei	Security Exchange Name SecurityExchangeName	NASDAQ
	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
	dei	Entity Small Business EntitySmallBusiness	false
	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
	dei	Entity Shell Company EntityShellCompany	false
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CY2020Q2	us-gaap	Net Income Loss NetIncomeLoss	16981000	USD
	us-gaap	Net Income Loss NetIncomeLoss	72398000	USD
	us-gaap	Net Income Loss NetIncomeLoss	41249000	USD
CY2021Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	41500000	shares
CY2020Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	40513000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	41478000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	40365000	shares
CY2021Q2	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	41818000	shares
CY2020Q2	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	40677000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	41759000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	40561000	shares
CY2021Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.01
CY2020Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.42
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.75
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.02
CY2021Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.01
CY2020Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.42
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.73
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.02
CY2021Q2	us-gaap	Net Income Loss NetIncomeLoss	42069000	USD
CY2020Q2	us-gaap	Net Income Loss NetIncomeLoss	16981000	USD
	us-gaap	Net Income Loss NetIncomeLoss	72398000	USD
	us-gaap	Net Income Loss NetIncomeLoss	41249000	USD
CY2021Q2	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	38000	USD
CY2020Q2	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	-32000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	43000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	-34000	USD
CY2021Q2	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-11000	USD
CY2020Q2	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	92000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-52000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	218000	USD
CY2021Q2	us-gaap	Other Comprehensive Income Availableforsale Securities Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesTaxPortionAttributableToParent	-10000	USD
CY2020Q2	us-gaap	Other Comprehensive Income Availableforsale Securities Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesTaxPortionAttributableToParent	26000	USD
	us-gaap	Other Comprehensive Income Availableforsale Securities Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesTaxPortionAttributableToParent	-20000	USD
	us-gaap	Other Comprehensive Income Availableforsale Securities Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesTaxPortionAttributableToParent	53000	USD
CY2021Q2	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	-39000	USD
CY2020Q2	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	98000	USD
	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	-75000	USD
	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	199000	USD
CY2021Q2	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Before Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent	-190000	USD
CY2020Q2	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Before Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent	-137000	USD
	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Before Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent	-394000	USD
	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Before Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent	-275000	USD
CY2021Q2	us-gaap	Other Comprehensive Income Defined Benefit Plans Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansTaxPortionAttributableToParent	-50000	USD
CY2020Q2	us-gaap	Other Comprehensive Income Defined Benefit Plans Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansTaxPortionAttributableToParent	-36000	USD
	us-gaap	Other Comprehensive Income Defined Benefit Plans Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansTaxPortionAttributableToParent	-103000	USD
	us-gaap	Other Comprehensive Income Defined Benefit Plans Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansTaxPortionAttributableToParent	-72000	USD
CY2021Q2	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	-140000	USD
CY2020Q2	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	-101000	USD
	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	-291000	USD
	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	-203000	USD
CY2021Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	101000	USD
CY2020Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	199000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	216000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	402000	USD
CY2021Q2	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	42170000	USD
CY2020Q2	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	17180000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	72614000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	41651000	USD
CY2021Q1	us-gaap	Stockholders Equity StockholdersEquity	887866000	USD
CY2021Q2	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	-22000	USD
CY2021Q2	us-gaap	Net Income Loss NetIncomeLoss	42069000	USD
CY2021Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	101000	USD
CY2021Q2	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	1327000	USD
CY2021Q2	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.39
CY2021Q2	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	16218000	USD
CY2021Q2	us-gaap	Stockholders Equity StockholdersEquity	915123000	USD
CY2020Q1	us-gaap	Stockholders Equity StockholdersEquity	800019000	USD
CY2020Q2	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	18597000	USD
CY2020Q2	us-gaap	Net Income Loss NetIncomeLoss	16981000	USD
CY2020Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	199000	USD
CY2020Q2	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	1237000	USD
CY2020Q2	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.37
CY2020Q2	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	14978000	USD
CY2020Q2	us-gaap	Stockholders Equity StockholdersEquity	822055000	USD
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	870966000	USD
	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	-48000	USD
	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	1507000	USD
	us-gaap	Net Income Loss NetIncomeLoss	72398000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	216000	USD
	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	5524000	USD
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.78
	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	32426000	USD
CY2021Q2	us-gaap	Stockholders Equity StockholdersEquity	915123000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	781482000	USD
	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	26869000	USD
	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	2069000	USD
	us-gaap	Net Income Loss NetIncomeLoss	41249000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	402000	USD
	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	4007000	USD
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.74
	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	29885000	USD
CY2020Q2	us-gaap	Stockholders Equity StockholdersEquity	822055000	USD
	us-gaap	Net Income Loss NetIncomeLoss	72398000	USD
	us-gaap	Net Income Loss NetIncomeLoss	41249000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	45295000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	40835000	USD
	us-gaap	Income Tax Credits And Adjustments IncomeTaxCreditsAndAdjustments	-372000	USD
	us-gaap	Income Tax Credits And Adjustments IncomeTaxCreditsAndAdjustments	-657000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	11327000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	9472000	USD
	ottr	Increase Decrease In Deferred Charges And Other Assets IncreaseDecreaseInDeferredChargesAndOtherAssets	5749000	USD
	ottr	Increase Decrease In Deferred Charges And Other Assets IncreaseDecreaseInDeferredChargesAndOtherAssets	5565000	USD
	us-gaap	Pension Contributions PensionContributions	10000000	USD
	us-gaap	Pension Contributions PensionContributions	11200000	USD
	ottr	Increase Decrease In Other Operating Liabilities And Increase Decrease In Deferred Liabilities IncreaseDecreaseInOtherOperatingLiabilitiesAndIncreaseDecreaseInDeferredLiabilities	3710000	USD
	ottr	Increase Decrease In Other Operating Liabilities And Increase Decrease In Deferred Liabilities IncreaseDecreaseInOtherOperatingLiabilitiesAndIncreaseDecreaseInDeferredLiabilities	-5178000	USD
	us-gaap	Increase Decrease In Allowance For Equity Funds Used During Construction IncreaseDecreaseInAllowanceForEquityFundsUsedDuringConstruction	172000	USD
	us-gaap	Increase Decrease In Allowance For Equity Funds Used During Construction IncreaseDecreaseInAllowanceForEquityFundsUsedDuringConstruction	1858000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	5524000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	4007000	USD
	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	3246000	USD
	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	147000	USD
	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	49465000	USD
	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	3929000	USD
	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	10859000	USD
	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-8097000	USD
	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	8080000	USD
	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	1066000	USD
	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	12375000	USD
	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	-23562000	USD
	ottr	Increase Decrease In Interest Payable And Income Taxes Receivable Payable Net IncreaseDecreaseInInterestPayableAndIncomeTaxesReceivablePayableNet	1810000	USD
	ottr	Increase Decrease In Interest Payable And Income Taxes Receivable Payable Net IncreaseDecreaseInInterestPayableAndIncomeTaxesReceivablePayableNet	1917000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	68574000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	73901000	USD
	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	76891000	USD
	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	119830000	USD
	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	4562000	USD
	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	3953000	USD
	us-gaap	Payments For Proceeds From Investments PaymentsForProceedsFromInvestments	4074000	USD
	us-gaap	Payments For Proceeds From Investments PaymentsForProceedsFromInvestments	5128000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-76403000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-121005000	USD
	ottr	Change In Checks Written In Excess Of Cash ChangeInChecksWrittenInExcessOfCash	4586000	USD
	ottr	Change In Checks Written In Excess Of Cash ChangeInChecksWrittenInExcessOfCash	-550000	USD
	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	46960000	USD
	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	35239000	USD
	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	0	USD
	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	27225000	USD
	us-gaap	Payments Of Stock Issuance Costs PaymentsOfStockIssuanceCosts	67000	USD
	us-gaap	Payments Of Stock Issuance Costs PaymentsOfStockIssuanceCosts	374000	USD
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	1507000	USD
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	2069000	USD
	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	0	USD
	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	35000000	USD
	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	59000	USD
	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	179000	USD
	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	169000	USD
	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	90000	USD
	us-gaap	Payments Of Dividends PaymentsOfDividends	32426000	USD
	us-gaap	Payments Of Dividends PaymentsOfDividends	29885000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	8146000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	65417000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	317000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	18313000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1163000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	21199000	USD
CY2021Q2	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1480000	USD
CY2020Q2	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	39512000	USD
CY2021Q2	ottr	Accounts Payable Outstanding Related To Capital Additions AccountsPayableOutstandingRelatedToCapitalAdditions	9875000	USD
CY2020Q2	ottr	Accounts Payable Outstanding Related To Capital Additions AccountsPayableOutstandingRelatedToCapitalAdditions	61925000	USD
CY2021Q2	us-gaap	Unbilled Receivables Current UnbilledReceivablesCurrent	18154000	USD
	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	3	segment
	us-gaap	Use Of Estimates UseOfEstimates	<div><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:700;line-height:120%">Use of Estimates</span></div><div style="margin-bottom:6pt"><span style="color:#000000;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:400;line-height:120%">We use estimates based on the best information available in recording transactions and balances resulting from business operations. As better information becomes available, or actual amounts are known, the recorded estimates are revised. Consequently, operating results can be affected by revisions to prior accounting estimates.</span></div>
	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	3	segment
CY2021Q2	us-gaap	Revenues Revenues	285608000	USD
CY2020Q2	us-gaap	Revenues Revenues	192756000	USD
	us-gaap	Revenues Revenues	547318000	USD
	us-gaap	Revenues Revenues	427503000	USD
CY2021Q2	us-gaap	Net Income Loss NetIncomeLoss	42069000	USD
CY2020Q2	us-gaap	Net Income Loss NetIncomeLoss	16981000	USD
	us-gaap	Net Income Loss NetIncomeLoss	72398000	USD
	us-gaap	Net Income Loss NetIncomeLoss	41249000	USD
CY2021Q2	us-gaap	Assets Assets	2671587000	USD
CY2020Q4	us-gaap	Assets Assets	2578354000	USD
CY2021Q2	us-gaap	Revenues Revenues	285608000	USD
CY2020Q2	us-gaap	Revenues Revenues	192756000	USD
	us-gaap	Revenues Revenues	547318000	USD
	us-gaap	Revenues Revenues	427503000	USD
CY2021Q2	us-gaap	Accounts Receivable Gross Current AccountsReceivableGrossCurrent	135744000	USD
CY2020Q4	us-gaap	Accounts Receivable Gross Current AccountsReceivableGrossCurrent	87048000	USD
CY2021Q2	us-gaap	Other Receivables Gross Current OtherReceivablesGrossCurrent	12252000	USD
CY2020Q4	us-gaap	Other Receivables Gross Current OtherReceivablesGrossCurrent	8939000	USD
CY2020Q4	us-gaap	Unbilled Receivables Current UnbilledReceivablesCurrent	21187000	USD
CY2021Q2	us-gaap	Accounts Receivable Gross AccountsReceivableGross	166150000	USD
CY2020Q4	us-gaap	Accounts Receivable Gross AccountsReceivableGross	117174000	USD
CY2021Q2	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	2726000	USD
CY2020Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	3215000	USD
CY2021Q2	us-gaap	Accounts Receivable Net AccountsReceivableNet	163424000	USD
CY2020Q4	us-gaap	Accounts Receivable Net AccountsReceivableNet	113959000	USD
CY2020Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	3215000	USD
CY2019Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	1339000	USD
	us-gaap	Allowance For Doubtful Accounts Receivable Period Increase Decrease AllowanceForDoubtfulAccountsReceivablePeriodIncreaseDecrease	284000	USD
	us-gaap	Allowance For Doubtful Accounts Receivable Period Increase Decrease AllowanceForDoubtfulAccountsReceivablePeriodIncreaseDecrease	1371000	USD
	ottr	Accounts Receivable Allowance For Credit Loss Writeoff After Recovery AccountsReceivableAllowanceForCreditLossWriteoffAfterRecovery	773000	USD
	ottr	Accounts Receivable Allowance For Credit Loss Writeoff After Recovery AccountsReceivableAllowanceForCreditLossWriteoffAfterRecovery	655000	USD
CY2021Q2	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	2726000	USD
CY2020Q2	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	2055000	USD
CY2021Q2	us-gaap	Inventory Finished Goods Net Of Reserves InventoryFinishedGoodsNetOfReserves	21272000	USD
CY2020Q4	us-gaap	Inventory Finished Goods Net Of Reserves InventoryFinishedGoodsNetOfReserves	22046000	USD
CY2021Q2	us-gaap	Inventory Work In Process InventoryWorkInProcess	24140000	USD
CY2020Q4	us-gaap	Inventory Work In Process InventoryWorkInProcess	16210000	USD
CY2021Q2	us-gaap	Inventory Raw Materials And Supplies InventoryRawMaterialsAndSupplies	57612000	USD
CY2020Q4	us-gaap	Inventory Raw Materials And Supplies InventoryRawMaterialsAndSupplies	53909000	USD
CY2021Q2	us-gaap	Inventory Net InventoryNet	103024000	USD
CY2020Q4	us-gaap	Inventory Net InventoryNet	92165000	USD
CY2021Q2	us-gaap	Life Insurance Corporate Or Bank Owned Amount LifeInsuranceCorporateOrBankOwnedAmount	39492000	USD
CY2020Q4	us-gaap	Life Insurance Corporate Or Bank Owned Amount LifeInsuranceCorporateOrBankOwnedAmount	36825000	USD
CY2021Q2	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	9227000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	9260000	USD
CY2021Q2	us-gaap	Money Market Funds At Carrying Value MoneyMarketFundsAtCarryingValue	1861000	USD
CY2020Q4	us-gaap	Money Market Funds At Carrying Value MoneyMarketFundsAtCarryingValue	4075000	USD
CY2021Q2	us-gaap	Equity Securities Fv Ni EquitySecuritiesFvNi	5201000	USD
CY2020Q4	us-gaap	Equity Securities Fv Ni EquitySecuritiesFvNi	1662000	USD
CY2021Q2	us-gaap	Other Investments OtherInvestments	28000	USD
CY2020Q4	us-gaap	Other Investments OtherInvestments	34000	USD
CY2021Q2	us-gaap	Investments Investments	55809000	USD
CY2020Q4	us-gaap	Investments Investments	51856000	USD
CY2021Q2	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	2073009000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	2049273000	USD
CY2021Q2	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	23250000	USD
CY2021Q2	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	160018000	USD
CY2020Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	21900000	USD
CY2020Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	168395000	USD
CY2021Q2	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	17301000	USD
CY2021Q2	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	231766000	USD
CY2020Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	16663000	USD
CY2020Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	233973000	USD
CY2020Q4	us-gaap	Line Of Credit Facility Maximum Borrowing Capacity LineOfCreditFacilityMaximumBorrowingCapacity	340000000	USD
CY2021Q2	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	624540000	USD
CY2021Q2	us-gaap	Line Of Credit Facility Maximum Borrowing Capacity LineOfCreditFacilityMaximumBorrowingCapacity	340000000	USD
CY2021Q2	us-gaap	Short Term Borrowings ShortTermBorrowings	127957000	USD
CY2021Q2	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	12671000	USD
CY2021Q2	us-gaap	Line Of Credit Facility Remaining Borrowing Capacity LineOfCreditFacilityRemainingBorrowingCapacity	199372000	USD
CY2020Q4	us-gaap	Line Of Credit Facility Remaining Borrowing Capacity LineOfCreditFacilityRemainingBorrowingCapacity	244902000	USD
CY2021Q2	us-gaap	Long Term Debt LongTermDebt	767000000	USD
CY2020Q4	us-gaap	Long Term Debt LongTermDebt	767169000	USD
CY2021Q2	us-gaap	Long Term Debt Current LongTermDebtCurrent	139963000	USD
CY2020Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	140087000	USD
CY2021Q2	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	2497000	USD
CY2020Q4	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	2650000	USD
CY2020Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	624432000	USD
CY2021Q2	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2020Q2	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2021Q2	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.050
CY2020Q2	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.050
	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.050
	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.050
CY2021Q2	ottr	Effective Income Tax Rate Reconciliation Tax Credit Production Percent EffectiveIncomeTaxRateReconciliationTaxCreditProductionPercent	0.063
CY2020Q2	ottr	Effective Income Tax Rate Reconciliation Tax Credit Production Percent EffectiveIncomeTaxRateReconciliationTaxCreditProductionPercent	0
	ottr	Effective Income Tax Rate Reconciliation Tax Credit Production Percent EffectiveIncomeTaxRateReconciliationTaxCreditProductionPercent	0.068
	ottr	Effective Income Tax Rate Reconciliation Tax Credit Production Percent EffectiveIncomeTaxRateReconciliationTaxCreditProductionPercent	0
CY2021Q2	ottr	Effective Income Tax Rate Reconciliation Amortization Of Excess Deferred Taxes EffectiveIncomeTaxRateReconciliationAmortizationOfExcessDeferredTaxes	-0.020
CY2020Q2	ottr	Effective Income Tax Rate Reconciliation Amortization Of Excess Deferred Taxes EffectiveIncomeTaxRateReconciliationAmortizationOfExcessDeferredTaxes	-0.034
	ottr	Effective Income Tax Rate Reconciliation Amortization Of Excess Deferred Taxes EffectiveIncomeTaxRateReconciliationAmortizationOfExcessDeferredTaxes	-0.024
	ottr	Effective Income Tax Rate Reconciliation Amortization Of Excess Deferred Taxes EffectiveIncomeTaxRateReconciliationAmortizationOfExcessDeferredTaxes	-0.038
CY2021Q2	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Other EffectiveIncomeTaxRateReconciliationTaxCreditsOther	0.003
CY2020Q2	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Other EffectiveIncomeTaxRateReconciliationTaxCreditsOther	0.012
	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Other EffectiveIncomeTaxRateReconciliationTaxCreditsOther	0.003
	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Other EffectiveIncomeTaxRateReconciliationTaxCreditsOther	0.010
CY2021Q2	us-gaap	Effective Income Tax Rate Reconciliation Deductions Employee Stock Ownership Plan Dividends EffectiveIncomeTaxRateReconciliationDeductionsEmployeeStockOwnershipPlanDividends	0
CY2020Q2	us-gaap	Effective Income Tax Rate Reconciliation Deductions Employee Stock Ownership Plan Dividends EffectiveIncomeTaxRateReconciliationDeductionsEmployeeStockOwnershipPlanDividends	0.006
	us-gaap	Effective Income Tax Rate Reconciliation Deductions Employee Stock Ownership Plan Dividends EffectiveIncomeTaxRateReconciliationDeductionsEmployeeStockOwnershipPlanDividends	0
	us-gaap	Effective Income Tax Rate Reconciliation Deductions Employee Stock Ownership Plan Dividends EffectiveIncomeTaxRateReconciliationDeductionsEmployeeStockOwnershipPlanDividends	0.010
CY2021Q2	ottr	Effective Income Tax Rate Reconciliation Allowance For Equity Funds Used During Construction Percent EffectiveIncomeTaxRateReconciliationAllowanceForEquityFundsUsedDuringConstructionPercent	-0.001
CY2020Q2	ottr	Effective Income Tax Rate Reconciliation Allowance For Equity Funds Used During Construction Percent EffectiveIncomeTaxRateReconciliationAllowanceForEquityFundsUsedDuringConstructionPercent	-0.008
	ottr	Effective Income Tax Rate Reconciliation Allowance For Equity Funds Used During Construction Percent EffectiveIncomeTaxRateReconciliationAllowanceForEquityFundsUsedDuringConstructionPercent	-0.001
	ottr	Effective Income Tax Rate Reconciliation Allowance For Equity Funds Used During Construction Percent EffectiveIncomeTaxRateReconciliationAllowanceForEquityFundsUsedDuringConstructionPercent	-0.010
CY2021Q2	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.008
CY2020Q2	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.017
	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.006
	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.006
CY2021Q2	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.165
CY2020Q2	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.183
	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.158
	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.186
CY2021Q2	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	1300000	USD
CY2020Q2	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	1200000	USD
	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	5500000	USD
	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	4000000.0	USD
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	41759000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	40561000	shares
CY2021Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	41500000	shares
CY2020Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	40513000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	41478000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	40365000	shares
CY2021Q2	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	318000	shares
CY2020Q2	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	164000	shares
	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	281000	shares
	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	196000	shares
CY2021Q2	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	41818000	shares
CY2020Q2	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	40677000	shares

Files In Submission

Name	View Source	Status
0001466593-21-000056-index-headers.html	Edgar Link	pending
0001466593-21-000056-index.html	Edgar Link	pending
0001466593-21-000056.txt	Edgar Link	pending
0001466593-21-000056-xbrl.zip	Edgar Link	pending
a2021q210qex311.htm	Edgar Link	pending
a2021q210qex312.htm	Edgar Link	pending
a2021q210qex321.htm	Edgar Link	pending
a2021q210qex322.htm	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xlsx	Edgar Link	pending
MetaLinks.json	Edgar Link	pending
ottr-20210630.htm	Edgar Link	pending
ottr-20210630.xsd	Edgar Link	pending
ottr-20210630_cal.xml	Edgar Link	unprocessable
ottr-20210630_def.xml	Edgar Link	unprocessable
ottr-20210630_htm.xml	Edgar Link	completed
ottr-20210630_lab.xml	Edgar Link	unprocessable
ottr-20210630_pre.xml	Edgar Link	unprocessable
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report.css	Edgar Link	pending
Show.js	Edgar Link	pending

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$OTTR
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2021 Q2 Form 10-Q Financial Statement

#000146659321000056 Filed on August 06, 2021

Income Statement

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Facts In Submission

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$OTTR Otter Tail Corp Stock $ottr

2021 Q2 Form 10-Q Financial Statement

#000146659321000056 Filed on August 06, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$OTTR
Otter Tail Corp Stock $ottr