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Note 11 - Federal Income Taxes - Effective Income Tax Rate Reconciliation (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Tax at statutory rate $ 12,697,000 $ 10,883,000 $ 16,129,000
Tax-exempt interest (644,000) (620,000) (1,030,000)
Bank owned life insurance (804,000) (201,000) (948,000)
Effect of federal tax law change 0 0 1,336,000
Other (245,000) (264,000) (678,000)
Tax expense $ 11,004,000 $ 9,798,000 $ 14,809,000