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Note 13 - Income Taxes - Tax Rate Reconciliation (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Provision at statutory rate, amount                 $ 4,651 $ 2,829 $ 2,866
Provision at statutory rate, percent                 34.00% 34.00% 34.00%
Tax-exempt income, amount                 $ (1,045) $ (1,177) $ (1,347)
Tax-exempt income, percent                 (7.60%) (14.10%) (15.90%)
Nondeductible interest expense, amount                 $ 32 $ 32 $ 34
Nondeductible interest expense, percent                 0.20% 0.40% 0.40%
Nondeductible merger-related expense, amount                 $ 43 $ 186
Nondeductible merger-related expense, percent                 0.30% 2.20%
Stock-based compensation, amount                 $ (50)
Stock-based compensation, percent                 (0.40%)
Change in effective corporate tax rate, amount                 $ 401
Change in effective corporate tax rate, percent                 2.90%
Other, amount                 $ 190 $ 35 $ 9
Other, percent                 1.50% 0.40%
Total provision $ 1,687 $ 914 $ 885 $ 736 $ 776 $ 261 $ 566 $ 302 $ 4,222 $ 1,905 $ 1,562
Actual tax expense and effective rate, percent                 30.90% 22.90% 18.50%