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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%

X
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