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Note 14 - Income Taxes - Effective Income Tax Rate (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Income Before Income Taxes	$ 29,906	$ 31,952
Tax Computed at Company’s Net Composite Federal and State Statutory Rate (26%)	7,776	8,308
Increases (Decreases) in Tax from:
Differences Reversing in Excess of Federal Rates	(1,229)	(983)
Excess Tax Deduction – Equity Method Stock Awards	(402)	(827)
Allowance for Funds Used During Construction – Equity	(312)	(86)
North Dakota Wind Tax Credit Amortization – Net of Federal Taxes	(258)	(258)
Research and Development and Other Tax Credits	(54)	(188)
Corporate Owned Life Insurance	207	(409)
Other Items – Net	(90)	71
Income Tax Expense	$ 5,638	$ 5,628
Effective Income Tax Rate	18.90%	17.60%

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