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Note 14 - Income Tax Expense - Effective Income Tax Rate (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Before Income Taxes	$ 45,031	$ 29,681	$ 95,726	$ 80,402
Tax Computed at Company’s Net Composite Federal and State Statutory Rate (26%)	11,708	7,717	24,889	20,905
(Decreases) Increases in Tax from:
Differences Reversing in Excess of Federal Rates	(1,678)	(933)	(3,450)	(2,690)
Allowance for Funds Used During Construction – Equity	(388)	(239)	(948)	(419)
North Dakota Wind Tax Credit Amortization – Net of Federal Taxes	(259)	(258)	(775)	(774)
Research and Development and Other Tax Credits	(263)	(612)	(649)	(987)
Excess Tax Deduction – Equity Method Stock Awards	0	0	(535)	(827)
Corporate Owned Life Insurance	(155)	(50)	(141)	(609)
Reconciliation and Prior Period Adjustments	172	(688)	172	(722)
Other Items – Net	(40)	(1)	(20)	30
Income Tax Expense	$ 9,097	$ 4,936	$ 18,543	$ 13,907
Effective Income Tax Rate	20.20%	16.60%	19.40%	17.30%

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to corporate-owned life insurance.

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Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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