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Note 14 - Income Tax Expense - Effective Income Tax Rate (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Before Income Taxes	$ 20,789	$ 18,769	$ 50,695	$ 50,721
Tax Computed at Company’s Net Composite Federal and State Statutory Rate (26%)	5,405	4,879	13,181	13,187
(Decreases) Increases in Tax from:
Differences Reversing in Excess of Federal Rates	(543)	(774)	(1,772)	(1,757)
Allowance for Funds Used During Construction – Equity	(248)	(94)	(560)	(180)
Excess Tax Deduction – Equity Method Stock Awards	0	0	(535)	(827)
North Dakota Wind Tax Credit Amortization – Net of Federal Taxes	(258)	(258)	(516)	(516)
Research and Development and Other Tax Credits	(333)	(187)	(387)	(375)
Corporate Owned Life Insurance	(193)	(150)	14	(559)
Other Items – Net	(22)	(73)	21	(2)
Income Tax Expense	$ 3,808	$ 3,343	$ 9,446	$ 8,971
Effective Income Tax Rate	18.30%	17.80%	18.60%	17.70%

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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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