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Note 2 - Securities (Details Textual) $ in Thousands |  | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 01, 2019 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($) | Dec. 31, 2018 USD ($)
Weighted Average Re-pricing Term |  | 3 years 255 days |  | 4 years 219 days |
Debt Securities, Held-to-maturity, Fair Value, Total |  | $ 18,796 |  | $ 42,394 |
Debt Securities, Available-for-sale, Total |  | 119,510 |  | $ 99,857 | [1]
Other Comprehensive Income (Loss), Transfers from Held-to-maturity to Available-for-Sale Securities, before Tax |  | $ (431) |  |  |
Accounting Standards Update 2017-12 [Member] |  |  |  |  |
Debt Securities, Held-to-maturity, Fair Value, Total | $ 23,000 |  |  |  |
Debt Securities, Available-for-sale, Total | 23,400 |  |  |  |
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 |  | 39 |  | 83 |
Available-for-Sale Securities, Number of Securities |  | 90 |  | 90 |
Debt Securities, Held-to-maturity, Fair Value, Total |  | $ 13,610 |  | $ 26,551 |
Debt Securities, Available-for-sale, Total |  | $ 92,683 |  | $ 84,922 |
Municipal Bonds [Member] |  |  |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Total |  | 4 |  | 56 |
Available-for-Sale Securities, Number of Securities |  | 83 |  | 82 |
Debt Securities, Held-to-maturity, Fair Value, Total |  | $ 3,664 |  | $ 14,334 |
Debt Securities, Available-for-sale, Total |  | $ 26,827 |  | $ 14,935 |
[1] | Derived from audited consolidated financial statements.

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