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Note 3 - Debt Securities - Securities by Contractual Maturity (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Securities available for sale, due within one year, amortized cost | $ 0 |
Securities available for sale, due after one year but within five years, amortized cost | 24,485 |
Securities available for sale, due after five years but within ten years, amortized cost | 20,020 |
Securities available for sale, due after ten years, amortized cost | 0 |
Securities available for sale, single maturity date, amortized cost | 44,505 |
Securities available for sale, amortized cost | 81,958 | $ 168,478
Securities available for sale, due within one year, fair value | 0 |
Securities available for sale, due after one year but within five years, fair value | 24,703 |
Securities available for sale, due after five years but within ten years, fair value | 20,307 |
Securities available for sale, due after ten years, fair value | 0 |
Securities available for sale, single maturity date, fair value | 45,010 |
Securities available for sale | 83,358 | 169,574
US Government Agencies Debt Securities [Member] |  |
Securities available for sale, due within one year, amortized cost | 0 |
Securities available for sale, due after one year but within five years, amortized cost | 0 |
Securities available for sale, due after five years but within ten years, amortized cost | 555 |
Securities available for sale, due after ten years, amortized cost | 0 |
Securities available for sale, single maturity date, amortized cost | 555 |
Securities available for sale, amortized cost | 555 | 5,038
Securities available for sale, due within one year, fair value | 0 |
Securities available for sale, due after one year but within five years, fair value | 0 |
Securities available for sale, due after five years but within ten years, fair value | 551 |
Securities available for sale, due after ten years, fair value | 0 |
Securities available for sale, single maturity date, fair value | 551 |
Securities available for sale | 551 | 5,034
US States and Political Subdivisions Debt Securities [Member] |  |
Securities available for sale, due within one year, amortized cost | 0 |
Securities available for sale, due after one year but within five years, amortized cost | 24,485 |
Securities available for sale, due after five years but within ten years, amortized cost | 19,465 |
Securities available for sale, due after ten years, amortized cost | 0 |
Securities available for sale, single maturity date, amortized cost | 43,950 |
Securities available for sale, amortized cost | 43,950 | 85,992
Securities available for sale, due within one year, fair value | 0 |
Securities available for sale, due after one year but within five years, fair value | 24,703 |
Securities available for sale, due after five years but within ten years, fair value | 19,756 |
Securities available for sale, due after ten years, fair value | 0 |
Securities available for sale, single maturity date, fair value | 44,459 |
Securities available for sale | 44,459 | $ 86,878
Collateralized Mortgage Backed Securities [Member] |  |
Securities available for sale, no single maturity date, amortized cost | 37,453 |
Securities available for sale, no single maturity date, fair value | $ 38,348 |

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