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Note 10 - Income Taxes - Reconciliation of Income Tax Provision (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Federal income taxes due at statutory rate $ 19,109 $ 30,509 $ 27,985
Reductions in income taxes resulting from:      
Interest on state and municipal securities and loans not taxable for federal income tax purposes (4,375) (7,794) (8,382)
State franchise taxes, net of federal income tax benefit 7,173 5,586 4,843
Re-measurement of net deferred tax asset due to enactment of new federal tax rate 12,315
Stock compensation deduction in excess of book expense (528) (583)
Tax credits (1,291) (1,850) (2,286)
Dividend received deduction (32) (60) (52)
Cash value life insurance (490) (603) (607)
Other (133) (373) (397)
Provision for income taxes $ 19,433 $ 37,147 $ 21,104