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Note 14 - Income Taxes - Reconciliation of Income Tax (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Statutory provision |  |  |  |  |  |  |  |  | $ 4,916 | $ 5,515 |
Statutory provision, percentage |  |  |  |  |  |  |  |  | 21.00% | 21.00% | 35.00%
Tax-exempt interest income |  |  |  |  |  |  |  |  | $ (853) | $ (1,046) |
Tax-exempt interest income, percentage |  |  |  |  |  |  |  |  | (3.64%) | (3.98%) |
Increase in cash surrender value and other income from life insurance, net |  |  |  |  |  |  |  |  | $ (91) | $ (170) |
Increase in cash surrender value and other income from life insurance, net, percentage |  |  |  |  |  |  |  |  | (0.39%) | (0.65%) |
ESOP Dividends |  |  |  |  |  |  |  |  | $ (113) | $ (98) |
ESOP Dividends, percentage |  |  |  |  |  |  |  |  | (0.48%) | (0.37%) |
State income tax, net of Federal benefit |  |  |  |  |  |  |  |  | $ 122 | $ 125 |
State income tax, net of federal benefit, percentage |  |  |  |  |  |  |  |  | 0.52% | 0.48% |
Other, net |  |  |  |  |  |  |  |  | $ (76) | $ (76) |
Other, net, percentage |  |  |  |  |  |  |  |  | (0.32%) | (0.29%) |
Effective income tax provision | $ 1,135 | $ 1,096 | $ 693 | $ 981 | $ 1,021 | $ 1,111 | $ 1,377 | $ 741 | $ 3,905 | $ 4,250 |
Effective income tax provision, percentage |  |  |  |  |  |  |  |  | 16.68% | 16.18% |

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- Definition The portion of the difference between total income tax expense or benefit as reported in the Income Statement for the period and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to the increase in cash surrender value of life insurance. + References No definition available. + Details
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