$OTTR
Otter Tail Corp Stock $ottr

$ottr Overview Financials Valuation SEC Filings Company Website

2021 Q4 Form 10-Q Financial Statement

#000146659321000073 Filed on November 03, 2021

Income Statement

Concept	2021 Q4	2021 Q3	2020 Q3
Revenue	$333.2M	$316.3M	$235.8M
YoY Change	46.93%	34.16%	3.11%
Cost Of Revenue	$154.7M	$144.1M	$100.3M
YoY Change	57.26%	43.66%	-1.57%
Gross Profit	$178.5M	$172.2M	$135.5M
YoY Change	39.01%	27.09%	6.86%
Gross Profit Margin	53.56%	54.44%	57.47%
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$23.25M	$22.82M	$20.40M
YoY Change	11.77%	11.87%	3.75%
% of Gross Profit	13.03%	13.25%	15.05%
Operating Expenses	$107.3M	$97.68M	$82.70M
YoY Change	6.8%	18.11%	-7.6%
Operating Profit	$71.16M	$74.53M	$52.73M
YoY Change	155.05%	41.34%	41.54%
Interest Expense	-$9.170M	-$9.648M	-$8.600M
YoY Change	0.77%	12.19%	14.67%
% of Operating Profit	-12.89%	-12.95%	-16.31%
Other Income/Expense, Net	$300.0K	$203.0K	$1.712M
YoY Change	-80.0%	-88.14%	67.84%
Pretax Income	$62.29M	$64.58M	$45.03M
YoY Change	206.84%	43.41%	51.72%
Income Tax	$10.67M	$11.82M	$9.097M
% Of Pretax Income	17.13%	18.31%	20.2%
Net Earnings	$51.62M	$52.75M	$35.93M
YoY Change	176.03%	46.81%	45.22%
Net Earnings / Revenue	15.49%	16.68%	15.24%
Basic Earnings Per Share		$1.27	$0.88
Diluted Earnings Per Share	$1.232M	$1.26	$0.87
COMMON SHARES
Basic Shares Outstanding	41.54M shares	41.50M shares	40.91M shares
Diluted Shares Outstanding		41.87M shares	41.08M shares

Balance Sheet

Concept	2021 Q4	2021 Q3	2020 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments	$1.537M	$1.272M	$44.90M
YoY Change	28.08%	-97.17%	4888.89%
Cash & Equivalents	$1.537M	$1.272M	$44.90M
Short-Term Investments
Other Short-Term Assets	$17.03M	$17.80M	$7.552M
YoY Change	201.72%	135.75%	9.04%
Inventory	$148.5M	$114.6M	$81.87M
Prepaid Expenses
Receivables	$140.5M	$150.6M	$100.4M
Other Receivables	$10.59M	$11.18M	$6.322M
Total Short-Term Assets	$369.4M	$335.0M	$274.9M
YoY Change	57.28%	21.84%	15.68%
LONG-TERM ASSETS
Property, Plant & Equipment	$2.125B	$2.083B	$1.993B
YoY Change	3.68%	4.54%	17.77%
Goodwill	$37.57M	$37.57M	$37.57M
YoY Change	0.0%	0.0%	0.0%
Intangibles	$9.044M	$9.319M	$10.42M
YoY Change	-10.84%	-10.56%	-9.89%
Long-Term Investments	$56.69M	$55.46M	$10.80M
YoY Change	9.23%	413.48%	11.34%
Other Assets	$32.06M	$34.10M	$42.32M
YoY Change	21.97%	-19.43%	8.51%
Total Long-Term Assets	$2.385B	$2.378B	$2.260B
YoY Change	1.79%	5.25%	16.32%
TOTAL ASSETS
Total Short-Term Assets	$369.4M	$335.0M	$274.9M
Total Long-Term Assets	$2.385B	$2.378B	$2.260B
Total Assets	$2.755B	$2.713B	$2.535B
YoY Change	6.84%	7.05%	16.25%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$135.1M	$135.4M	$189.3M
YoY Change	12.0%	-28.46%	111.87%
Accrued Expenses	$87.38M	$28.46M	$34.40M
YoY Change	76.87%	-17.28%	12.42%
Deferred Revenue
YoY Change
Short-Term Debt	$91.16M	$97.86M	$48.60M
YoY Change	12.55%	101.35%	-55.41%
Long-Term Debt Due	$29.98M	$170.0M	$215.0K
YoY Change	-78.6%	78952.09%	19.44%
Total Short-Term Liabilities	$387.7M	$510.1M	$299.7M
YoY Change	-11.24%	70.18%	18.39%
LONG-TERM LIABILITIES
Long-Term Debt	$734.0M	$594.6M	$764.3M
YoY Change	17.55%	-22.2%	29.53%
Other Long-Term Liabilities	$62.53M	$62.34M	$35.15M
YoY Change	4.21%	77.38%	24.94%
Total Long-Term Liabilities	$642.3M	$656.0M	$799.4M
YoY Change	-0.59%	-17.95%	29.33%
TOTAL LIABILITIES
Total Short-Term Liabilities	$387.7M	$510.1M	$299.7M
Total Long-Term Liabilities	$642.3M	$656.0M	$799.4M
Total Liabilities	$1.030B	$1.166B	$1.099B
YoY Change	-4.89%	6.09%	26.15%
SHAREHOLDERS EQUITY
Retained Earnings	$369.8M	$334.4M	$254.5M
YoY Change	43.39%	31.41%	17.85%
Common Stock	$627.5M	$626.3M	$603.6M
YoY Change	0.95%	3.76%	10.73%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$990.8M	$952.5M	$852.1M
YoY Change
Total Liabilities & Shareholders Equity	$2.755B	$2.713B	$2.535B
YoY Change	6.84%	7.05%	16.25%

Cashflow Statement

Concept	2021 Q4	2021 Q3	2020 Q3
OPERATING ACTIVITIES
Net Income	$51.62M	$52.75M	$35.93M
YoY Change	176.03%	46.81%	45.22%
Depreciation, Depletion And Amortization	$23.25M	$22.82M	$20.40M
YoY Change	11.77%	11.87%	3.75%
Cash From Operating Activities	$76.49M	$86.18M	$67.40M
YoY Change	8.34%	27.86%	88.27%
INVESTING ACTIVITIES
Capital Expenditures	-$54.52M	-$40.42M	-$100.8M
YoY Change	-63.9%	-59.9%	5.33%
Acquisitions
YoY Change
Other Investing Activities	$91.00K	-$260.0K	-$600.0K
YoY Change	-103.96%	-56.67%
Cash From Investing Activities	-$54.43M	-$40.68M	-$101.4M
YoY Change	-64.5%	-59.88%	5.96%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-21.80M	-45.71M	39.40M
YoY Change	-156.04%	-216.0%	-34.11%
NET CHANGE
Cash From Operating Activities	76.49M	86.18M	67.40M
Cash From Investing Activities	-54.43M	-40.68M	-101.4M
Cash From Financing Activities	-21.80M	-45.71M	39.40M
Net Change In Cash	265.0K	-208.0K	5.400M
YoY Change	-100.61%	-103.85%	-5500.0%
FREE CASH FLOW
Cash From Operating Activities	$76.49M	$86.18M	$67.40M
Capital Expenditures	-$54.52M	-$40.42M	-$100.8M
Free Cash Flow	$131.0M	$126.6M	$168.2M
YoY Change	-40.88%	-24.73%	27.91%

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	Q3
	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	2021-09-30
	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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CY2021Q3	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
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	us-gaap	Net Income Loss NetIncomeLoss	125152000	USD
	us-gaap	Net Income Loss NetIncomeLoss	77183000	USD
CY2020Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	41078000	shares
CY2021Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	41504000	shares
CY2020Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	40914000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	41487000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	40548000	shares
CY2021Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	41869000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	41795000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	40733000	shares
CY2021Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.27
CY2020Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.88
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.02
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.90
CY2021Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.26
CY2020Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.87
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.99
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.89
CY2021Q3	us-gaap	Net Income Loss NetIncomeLoss	52754000	USD
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	35934000	USD
	us-gaap	Net Income Loss NetIncomeLoss	125152000	USD
	us-gaap	Net Income Loss NetIncomeLoss	77183000	USD
CY2021Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	0	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	21000	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	-13000	USD
CY2021Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-33000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-13000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-85000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	205000	USD
CY2021Q3	us-gaap	Other Comprehensive Income Availableforsale Securities Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesTaxPortionAttributableToParent	-7000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Availableforsale Securities Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesTaxPortionAttributableToParent	-7000	USD
	us-gaap	Other Comprehensive Income Availableforsale Securities Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesTaxPortionAttributableToParent	-27000	USD
	us-gaap	Other Comprehensive Income Availableforsale Securities Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesTaxPortionAttributableToParent	46000	USD
CY2021Q3	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	-26000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	-27000	USD
	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	-101000	USD
	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	172000	USD
CY2021Q3	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Before Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent	-197000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Before Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent	-138000	USD
	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Before Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent	-591000	USD
	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Before Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent	-413000	USD
CY2021Q3	us-gaap	Other Comprehensive Income Defined Benefit Plans Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansTaxPortionAttributableToParent	-51000	USD
CY2020Q3	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	-154000	USD
	us-gaap	Other Comprehensive Income Defined Benefit Plans Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansTaxPortionAttributableToParent	-108000	USD
CY2021Q3	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	-146000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	-102000	USD
	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	-437000	USD
	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	-305000	USD
CY2021Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	120000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	75000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	336000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	477000	USD
CY2021Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	52874000	USD
CY2020Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	36009000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	125488000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	77660000	USD
CY2021Q2	us-gaap	Stockholders Equity StockholdersEquity	915123000	USD
CY2021Q3	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	0	USD
CY2021Q3	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	126000	USD
CY2021Q3	us-gaap	Net Income Loss NetIncomeLoss	52754000	USD
CY2021Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	120000	USD
CY2021Q3	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	830000	USD
CY2021Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.39
CY2021Q3	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	16219000	USD
CY2021Q3	us-gaap	Stockholders Equity StockholdersEquity	952482000	USD
CY2020Q2	us-gaap	Stockholders Equity StockholdersEquity	822055000	USD
CY2020Q3	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	7902000	USD
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	35934000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	75000	USD
CY2020Q3	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	1275000	USD
CY2020Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.37
CY2020Q3	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	15171000	USD
CY2020Q3	us-gaap	Stockholders Equity StockholdersEquity	852070000	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	1633000	USD
	us-gaap	Net Income Loss NetIncomeLoss	125152000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	336000	USD
	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	6354000	USD
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.17
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	477000	USD
	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	48645000	USD
CY2021Q3	us-gaap	Stockholders Equity StockholdersEquity	952482000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	781482000	USD
	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	34771000	USD
	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	2069000	USD
	us-gaap	Net Income Loss NetIncomeLoss	77183000	USD
	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	5282000	USD
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.11
	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	45056000	USD
CY2020Q3	us-gaap	Stockholders Equity StockholdersEquity	852070000	USD
	us-gaap	Net Income Loss NetIncomeLoss	125152000	USD
	us-gaap	Net Income Loss NetIncomeLoss	77183000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	68109000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	61230000	USD
	us-gaap	Income Tax Credits And Adjustments IncomeTaxCreditsAndAdjustments	-558000	USD
	us-gaap	Income Tax Credits And Adjustments IncomeTaxCreditsAndAdjustments	-986000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	18835000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	20353000	USD
	ottr	Increase Decrease In Deferred Charges And Other Assets IncreaseDecreaseInDeferredChargesAndOtherAssets	6166000	USD
	ottr	Increase Decrease In Deferred Charges And Other Assets IncreaseDecreaseInDeferredChargesAndOtherAssets	3439000	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	-2662000	USD
	ottr	Increase Decrease In Other Operating Liabilities And Increase Decrease In Deferred Liabilities IncreaseDecreaseInOtherOperatingLiabilitiesAndIncreaseDecreaseInDeferredLiabilities	-3237000	USD
	us-gaap	Increase Decrease In Allowance For Equity Funds Used During Construction IncreaseDecreaseInAllowanceForEquityFundsUsedDuringConstruction	427000	USD
	us-gaap	Increase Decrease In Allowance For Equity Funds Used During Construction IncreaseDecreaseInAllowanceForEquityFundsUsedDuringConstruction	3104000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	6354000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	5282000	USD
	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	3480000	USD
	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	176000	USD
	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	64800000	USD
	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	20025000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-117084000	USD
	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	22450000	USD
	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-15980000	USD
	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	12159000	USD
	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-2023000	USD
	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	40574000	USD
	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	-12063000	USD
	ottr	Increase Decrease In Interest Payable And Income Taxes Receivable Payable Net IncreaseDecreaseInInterestPayableAndIncomeTaxesReceivablePayableNet	774000	USD
	ottr	Increase Decrease In Interest Payable And Income Taxes Receivable Payable Net IncreaseDecreaseInInterestPayableAndIncomeTaxesReceivablePayableNet	103000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	154752000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	141276000	USD
	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	117312000	USD
	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	220630000	USD
	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	5819000	USD
	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	4617000	USD
	us-gaap	Payments For Proceeds From Investments PaymentsForProceedsFromInvestments	5591000	USD
	us-gaap	Payments For Proceeds From Investments PaymentsForProceedsFromInvestments	6372000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-222385000	USD
	ottr	Change In Checks Written In Excess Of Cash ChangeInChecksWrittenInExcessOfCash	3133000	USD
	ottr	Change In Checks Written In Excess Of Cash ChangeInChecksWrittenInExcessOfCash	-90000	USD
	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	16860000	USD
	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	42600000	USD
	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	0	USD
	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	35219000	USD
	us-gaap	Payments Of Stock Issuance Costs PaymentsOfStockIssuanceCosts	67000	USD
	us-gaap	Payments Of Stock Issuance Costs PaymentsOfStockIssuanceCosts	465000	USD
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	1633000	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	75000000	USD
	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	772000	USD
	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	369000	USD
	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	169000	USD
	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	136000	USD
	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	112314000	USD
	us-gaap	Payments Of Dividends PaymentsOfDividends	48645000	USD
	us-gaap	Payments Of Dividends PaymentsOfDividends	45056000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-37559000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	104814000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	109000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	23705000	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
CY2021Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1272000	USD
CY2020Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	44904000	USD
	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	14358000	USD
	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	3	segment
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	35934000	USD
	us-gaap	Net Income Loss NetIncomeLoss	125152000	USD
	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
CY2021Q3	us-gaap	Revenues Revenues	316294000	USD
CY2020Q3	us-gaap	Revenues Revenues	235755000	USD
	us-gaap	Revenues Revenues	863612000	USD
	us-gaap	Revenues Revenues	663258000	USD
CY2021Q3	us-gaap	Net Income Loss NetIncomeLoss	52754000	USD
	us-gaap	Net Income Loss NetIncomeLoss	77183000	USD
CY2021Q3	us-gaap	Assets Assets	2713148000	USD
CY2020Q4	us-gaap	Assets Assets	2578354000	USD
CY2021Q3	us-gaap	Revenues Revenues	316294000	USD
CY2020Q3	us-gaap	Revenues Revenues	235755000	USD
	us-gaap	Revenues Revenues	863612000	USD
	us-gaap	Revenues Revenues	663258000	USD
CY2021Q3	us-gaap	Accounts Receivable Gross Current AccountsReceivableGrossCurrent	152906000	USD
CY2020Q4	us-gaap	Accounts Receivable Gross Current AccountsReceivableGrossCurrent	87048000	USD
CY2021Q3	us-gaap	Other Receivables Gross Current OtherReceivablesGrossCurrent	11182000	USD
CY2020Q4	us-gaap	Other Receivables Gross Current OtherReceivablesGrossCurrent	8939000	USD
CY2021Q3	us-gaap	Unbilled Receivables Current UnbilledReceivablesCurrent	17003000	USD
CY2020Q4	us-gaap	Unbilled Receivables Current UnbilledReceivablesCurrent	21187000	USD
CY2021Q3	us-gaap	Accounts Receivable Gross AccountsReceivableGross	181091000	USD
CY2020Q4	us-gaap	Accounts Receivable Gross AccountsReceivableGross	117174000	USD
CY2020Q4	us-gaap	Accounts Receivable Net AccountsReceivableNet	113959000	USD
	us-gaap	Allowance For Doubtful Accounts Receivable Period Increase Decrease AllowanceForDoubtfulAccountsReceivablePeriodIncreaseDecrease	177000	USD
CY2021Q3	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	2332000	USD
CY2020Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	3215000	USD
CY2021Q3	us-gaap	Accounts Receivable Net AccountsReceivableNet	178759000	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	1845000	USD
	ottr	Accounts Receivable Allowance For Credit Loss Writeoff After Recovery AccountsReceivableAllowanceForCreditLossWriteoffAfterRecovery	1060000	USD
	ottr	Accounts Receivable Allowance For Credit Loss Writeoff After Recovery AccountsReceivableAllowanceForCreditLossWriteoffAfterRecovery	923000	USD
CY2021Q3	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	2332000	USD
CY2020Q3	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	2261000	USD
CY2021Q3	us-gaap	Inventory Finished Goods Net Of Reserves InventoryFinishedGoodsNetOfReserves	25727000	USD
CY2020Q4	us-gaap	Inventory Finished Goods Net Of Reserves InventoryFinishedGoodsNetOfReserves	22046000	USD
CY2021Q3	us-gaap	Inventory Work In Process InventoryWorkInProcess	29932000	USD
CY2020Q4	us-gaap	Inventory Work In Process InventoryWorkInProcess	16210000	USD
CY2021Q3	us-gaap	Inventory Raw Materials And Supplies InventoryRawMaterialsAndSupplies	58956000	USD
CY2020Q4	us-gaap	Inventory Raw Materials And Supplies InventoryRawMaterialsAndSupplies	53909000	USD
CY2021Q3	us-gaap	Inventory Net InventoryNet	114615000	USD
CY2020Q4	us-gaap	Inventory Net InventoryNet	92165000	USD
CY2021Q3	us-gaap	Life Insurance Corporate Or Bank Owned Amount LifeInsuranceCorporateOrBankOwnedAmount	40096000	USD
CY2020Q4	us-gaap	Life Insurance Corporate Or Bank Owned Amount LifeInsuranceCorporateOrBankOwnedAmount	36825000	USD
CY2021Q3	ottr	Effective Income Tax Rate Reconciliation Amortization Of Excess Deferred Taxes EffectiveIncomeTaxRateReconciliationAmortizationOfExcessDeferredTaxes	-0.016
CY2021Q3	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	9208000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	9260000	USD
CY2021Q3	us-gaap	Money Market Funds At Carrying Value MoneyMarketFundsAtCarryingValue	953000	USD
CY2020Q4	us-gaap	Money Market Funds At Carrying Value MoneyMarketFundsAtCarryingValue	4075000	USD
CY2021Q3	us-gaap	Equity Securities Fv Ni EquitySecuritiesFvNi	5170000	USD
CY2020Q4	us-gaap	Equity Securities Fv Ni EquitySecuritiesFvNi	1662000	USD
CY2021Q3	us-gaap	Other Investments OtherInvestments	29000	USD
CY2020Q4	us-gaap	Other Investments OtherInvestments	34000	USD
CY2021Q3	us-gaap	Investments Investments	55456000	USD
CY2020Q4	us-gaap	Investments Investments	51856000	USD
CY2021Q3	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	2083223000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	2049273000	USD
CY2021Q3	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	22517000	USD
CY2021Q3	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	158515000	USD
CY2020Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	21900000	USD
CY2020Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	168395000	USD
CY2021Q3	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	25323000	USD
CY2021Q3	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	230733000	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
CY2021Q3	us-gaap	Line Of Credit Facility Maximum Borrowing Capacity LineOfCreditFacilityMaximumBorrowingCapacity	340000000	USD
CY2021Q3	us-gaap	Short Term Borrowings ShortTermBorrowings	97857000	USD
CY2021Q3	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	13159000	USD
CY2021Q3	us-gaap	Line Of Credit Facility Remaining Borrowing Capacity LineOfCreditFacilityRemainingBorrowingCapacity	228984000	USD
CY2020Q4	us-gaap	Line Of Credit Facility Remaining Borrowing Capacity LineOfCreditFacilityRemainingBorrowingCapacity	244902000	USD
CY2021Q3	us-gaap	Long Term Debt LongTermDebt	767000000	USD
CY2020Q4	us-gaap	Long Term Debt LongTermDebt	767169000	USD
CY2021Q3	us-gaap	Long Term Debt Current LongTermDebtCurrent	169962000	USD
CY2020Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	140087000	USD
CY2021Q3	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	2419000	USD
CY2020Q4	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	2650000	USD
CY2021Q3	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	594619000	USD
CY2020Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	624432000	USD
CY2021Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	41504000	shares
CY2021Q3	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2020Q3	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
CY2021Q3	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.050
CY2020Q3	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
CY2021Q3	ottr	Effective Income Tax Rate Reconciliation Tax Credit Production Percent EffectiveIncomeTaxRateReconciliationTaxCreditProductionPercent	0.050
CY2020Q3	ottr	Effective Income Tax Rate Reconciliation Tax Credit Production Percent EffectiveIncomeTaxRateReconciliationTaxCreditProductionPercent	0
	ottr	Effective Income Tax Rate Reconciliation Tax Credit Production Percent EffectiveIncomeTaxRateReconciliationTaxCreditProductionPercent	0.060
	ottr	Effective Income Tax Rate Reconciliation Tax Credit Production Percent EffectiveIncomeTaxRateReconciliationTaxCreditProductionPercent	0
CY2020Q3	ottr	Effective Income Tax Rate Reconciliation Amortization Of Excess Deferred Taxes EffectiveIncomeTaxRateReconciliationAmortizationOfExcessDeferredTaxes	-0.029
	ottr	Effective Income Tax Rate Reconciliation Amortization Of Excess Deferred Taxes EffectiveIncomeTaxRateReconciliationAmortizationOfExcessDeferredTaxes	-0.020
	ottr	Effective Income Tax Rate Reconciliation Amortization Of Excess Deferred Taxes EffectiveIncomeTaxRateReconciliationAmortizationOfExcessDeferredTaxes	-0.034
CY2021Q3	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Other EffectiveIncomeTaxRateReconciliationTaxCreditsOther	0.002
CY2020Q3	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Other EffectiveIncomeTaxRateReconciliationTaxCreditsOther	0.006
	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Other EffectiveIncomeTaxRateReconciliationTaxCreditsOther	0.003
	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Other EffectiveIncomeTaxRateReconciliationTaxCreditsOther	0.008
CY2021Q3	ottr	Effective Income Tax Rate Reconciliation Excess Deduction Of Share Based Payment Awards Percent EffectiveIncomeTaxRateReconciliationExcessDeductionOfShareBasedPaymentAwardsPercent	0
CY2020Q3	ottr	Effective Income Tax Rate Reconciliation Excess Deduction Of Share Based Payment Awards Percent EffectiveIncomeTaxRateReconciliationExcessDeductionOfShareBasedPaymentAwardsPercent	-0.003
	ottr	Effective Income Tax Rate Reconciliation Excess Deduction Of Share Based Payment Awards Percent EffectiveIncomeTaxRateReconciliationExcessDeductionOfShareBasedPaymentAwardsPercent	0
	ottr	Effective Income Tax Rate Reconciliation Excess Deduction Of Share Based Payment Awards Percent EffectiveIncomeTaxRateReconciliationExcessDeductionOfShareBasedPaymentAwardsPercent	0.004
CY2021Q3	ottr	Effective Income Tax Rate Reconciliation Allowance For Equity Funds Used During Construction Percent EffectiveIncomeTaxRateReconciliationAllowanceForEquityFundsUsedDuringConstructionPercent	-0.001
CY2020Q3	ottr	Effective Income Tax Rate Reconciliation Allowance For Equity Funds Used During Construction Percent EffectiveIncomeTaxRateReconciliationAllowanceForEquityFundsUsedDuringConstructionPercent	-0.007
	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	-0.008
CY2021Q3	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.008
CY2020Q3	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.019
	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.007
	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.012
CY2021Q3	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.183
CY2020Q3	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.202
	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.169
	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.194
CY2021Q3	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	800000	USD
CY2020Q3	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	1300000	USD
	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	6400000	USD
	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	5300000	USD
CY2020Q3	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	164000	shares
	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	308000	shares
CY2020Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	40914000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	41487000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	40548000	shares
CY2021Q3	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	365000	shares
	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	185000	shares
CY2021Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	41869000	shares
CY2020Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	41078000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	41795000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	40733000	shares
CY2021Q3	us-gaap	Derivative Assets DerivativeAssets	6900000	USD

Files In Submission

Name	View Source	Status
0001466593-21-000073-index-headers.html	Edgar Link	pending
0001466593-21-000073-index.html	Edgar Link	pending
0001466593-21-000073.txt	Edgar Link	pending
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ottr-20210930.xsd	Edgar Link	pending
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$OTTR
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2021 Q4 Form 10-Q Financial Statement

#000146659321000073 Filed on November 03, 2021

Income Statement

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$OTTR Otter Tail Corp Stock $ottr

2021 Q4 Form 10-Q Financial Statement

#000146659321000073 Filed on November 03, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$OTTR
Otter Tail Corp Stock $ottr