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Note 7 - Securities - Available-for-sale Debt Securities by Contractual Maturity (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Due in one year or less, amortized cost | $ 7,216 |
Due in one year or less, fair value | 7,247 |
Due from one year through five years. amortized cost | 31,627 |
Due from one year through five years, fair value | 32,408 |
Due from five years through ten years, amortized cost | 42,709 |
Due from five years through ten years, fair value | 43,845 |
Due after ten years, amortized cost | 39,061 |
Due after ten years, fair value | 40,563 |
Sub-total, amortized cost | 120,613 |
Sub-total, fair value | 124,063 |
Total, amortized cost | 342,278 | $ 368,725
Total, fair value | 346,723 | 363,273
Residential Pass-Through Securities [Member] |  |
Mortgage-backed securities issued or guaranteed by U.S. Government agencies or sponsored agencies, amortized cost | 58,875 |
Mortgage-backed securities issued or guaranteed by U.S. Government agencies or sponsored agencies, fair value | 59,210 |
Total, amortized cost | 58,875 | 54,827
Total, fair value | 59,210 | 53,445
Residential Collateralized Mortgage Obligations [Member] |  |
Mortgage-backed securities issued or guaranteed by U.S. Government agencies or sponsored agencies, amortized cost | 115,025 |
Mortgage-backed securities issued or guaranteed by U.S. Government agencies or sponsored agencies, fair value | 114,723 |
Total, amortized cost | 115,025 | 148,964
Total, fair value | 114,723 | $ 145,912
Commercial Mortgage-backed Securities [Member] |  |
Mortgage-backed securities issued or guaranteed by U.S. Government agencies or sponsored agencies, amortized cost | 47,765 |
Mortgage-backed securities issued or guaranteed by U.S. Government agencies or sponsored agencies, fair value | $ 48,727 |

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