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Note 2 - Securities (Details Textual) $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 01, 2019 USD ($) | Mar. 31, 2020 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2019 USD ($)
Weighted Average Re-pricing Term (Year) |  | 3 years 36 days |  | 3 years 255 days
Debt Securities, Held-to-maturity, Fair Value, Total |  | $ 17,626 |  | $ 17,646
Other Comprehensive Income (Loss), Transfers from Held-to-maturity to Available-for-Sale Securities, before Tax |  |  | $ (431) |
Impairment Losses Related to Federal Home Loan Stock |  | 0 |  |
Other Assets [Member] |  |  |  |
Equity Securities without Readily Determinable Fair Value, Amount |  | $ 542 |  | $ 514
Accounting Standards Update 2017-12 [Member] |  |  |  |
Debt Securities, Held-to-maturity, Fair Value, Total | $ (23,000) |  |  |
Other Comprehensive Income (Loss), Transfers from Held-to-maturity to Available-for-Sale Securities, before Tax | $ 431 |  |  |
US Agency and Mortgage-backed Securities [Member] |  |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Total |  | 7 |  | 42
Available-for-Sale Securities, Number of Securities |  | 98 |  | 94
Debt Securities, Held-to-maturity, Fair Value, Total |  | $ 12,307 |  | $ 12,454
Municipal Bonds [Member] |  |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Total |  | 1 |  | 3
Available-for-Sale Securities, Number of Securities |  | 79 |  | 79
Debt Securities, Held-to-maturity, Fair Value, Total |  | $ 3,665 |  | $ 3,680

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