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Note 3 - Debt Securities - Securities by Contractual Maturity (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Securities available for sale, due within one year, amortized cost |  |
Securities available for sale, due after one year but within five years, amortized cost | 28,739 |
Securities available for sale, due after five years but within ten years, amortized cost | 50,882 |
Securities available for sale, due after ten years, amortized cost | 11,409 |
Securities available for sale, single maturity date, amortized cost | 91,030 |
Securities available for sale, amortized cost | 168,478 | $ 153,477
Securities available for sale, due within one year, fair value |  |
Securities available for sale, due after one year but within five years, fair value | 29,049 |
Securities available for sale, due after five years but within ten years, fair value | 51,454 |
Securities available for sale, due after ten years, fair value | 11,409 |
Securities available for sale, single maturity date, fair value | 91,912 |
Securities available for sale | 169,574 | 153,116
One year or less |  | 25,013
After one year through five years |  |
After five years through ten years |  |
After ten years |  |
Total amortized cost |  | 25,013
One year or less |  | 24,990
After one year through five years |  |
After five years through ten years |  |
After ten years |  |
Total fair value |  | 24,990
US Government Agencies Debt Securities [Member] |  |
Securities available for sale, due within one year, amortized cost |  |
Securities available for sale, due after one year but within five years, amortized cost |  |
Securities available for sale, due after five years but within ten years, amortized cost | 1,941 |
Securities available for sale, due after ten years, amortized cost | 3,097 |
Securities available for sale, single maturity date, amortized cost | 5,038 |
Securities available for sale, amortized cost | 5,038 | 1,108
Securities available for sale, due within one year, fair value |  |
Securities available for sale, due after one year but within five years, fair value |  |
Securities available for sale, due after five years but within ten years, fair value | 1,937 |
Securities available for sale, due after ten years, fair value | 3,097 |
Securities available for sale, single maturity date, fair value | 5,034 |
Securities available for sale | 5,034 | 1,113
One year or less |  | 17,887
After one year through five years |  |
After five years through ten years |  |
After ten years |  |
Total amortized cost |  | 17,887
One year or less |  | 17,867
After one year through five years |  |
After five years through ten years |  |
After ten years |  |
Total fair value |  | 17,867
US Treasury Securities [Member] |  |
Securities available for sale, due within one year, amortized cost |  |
Securities available for sale, due after one year but within five years, amortized cost |  |
Securities available for sale, due after five years but within ten years, amortized cost |  |
Securities available for sale, due after ten years, amortized cost |  |
Securities available for sale, single maturity date, amortized cost |  |
Securities available for sale, amortized cost |  | 19,970
Securities available for sale, due within one year, fair value |  |
Securities available for sale, due after one year but within five years, fair value |  |
Securities available for sale, due after five years but within ten years, fair value |  |
Securities available for sale, due after ten years, fair value |  |
Securities available for sale, single maturity date, fair value |  |
Securities available for sale |  | 19,960
US States and Political Subdivisions Debt Securities [Member] |  |
Securities available for sale, due within one year, amortized cost |  |
Securities available for sale, due after one year but within five years, amortized cost | 28,739 |
Securities available for sale, due after five years but within ten years, amortized cost | 48,941 |
Securities available for sale, due after ten years, amortized cost | 8,312 |
Securities available for sale, single maturity date, amortized cost | 85,992 |
Securities available for sale, amortized cost | 85,992 | 96,886
Securities available for sale, due within one year, fair value |  |
Securities available for sale, due after one year but within five years, fair value | 29,049 |
Securities available for sale, due after five years but within ten years, fair value | 49,517 |
Securities available for sale, due after ten years, fair value | 8,312 |
Securities available for sale, single maturity date, fair value | 86,878 |
Securities available for sale | 86,878 | 97,289
Corporate Debt Securities [Member] |  |
One year or less |  | 7,126
After one year through five years |  |
After five years through ten years |  |
After ten years |  |
Total amortized cost |  | 7,126
One year or less |  | 7,123
After one year through five years |  |
After five years through ten years |  |
After ten years |  |
Total fair value |  | $ 7,123
Collateralized Mortgage Backed Securities [Member] |  |
Securities available for sale, no single maturity date, amortized cost | 77,448 |
Securities available for sale, no single maturity date, fair value | $ 77,662 |

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