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Note 2 - Securities - Summary of Amortized Costs and Fair Values of Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Amortized cost, available for sale securities | $ 125,097 | $ 120,068
Gross unrealized gains, available for sale securities | 3,607 | 1,254
Gross unrealized losses, available for sale securities | (44) | (339)
Fair value, available for sale securities | 128,660 | 120,983
Amortized cost, held to maturity securities | 17,086 | 17,627
Gross unrealized gains, held to maturity securities | 540 | 99
Gross unrealized losses, held to maturity securities |  | (80)
Debt Securities, Held-to-maturity, Fair Value, Total | 17,626 | 17,646
Amortized cost, total securities | 142,183 | 137,695
Gross unrealized gains, total securities | 4,147 | 1,353
Gross unrealized losses, total securities | (44) | (419)
Total securities | 146,286 | 138,629
US Agency and Mortgage-backed Securities [Member] |  |
Amortized cost, available for sale securities | 99,536 | 94,461
Gross unrealized gains, available for sale securities | 3,093 | 778
Gross unrealized losses, available for sale securities | (32) | (334)
Fair value, available for sale securities | 102,597 | 94,905
Amortized cost, held to maturity securities | 11,992 | 12,528
Gross unrealized gains, held to maturity securities | 315 | 6
Gross unrealized losses, held to maturity securities |  | (80)
Debt Securities, Held-to-maturity, Fair Value, Total | 12,307 | 12,454
Municipal Bonds [Member] |  |
Amortized cost, available for sale securities | 25,561 | 25,607
Gross unrealized gains, available for sale securities | 514 | 476
Gross unrealized losses, available for sale securities | (12) | (5)
Fair value, available for sale securities | 26,063 | 26,078
Amortized cost, held to maturity securities | 3,594 | 3,599
Gross unrealized gains, held to maturity securities | 71 | 81
Gross unrealized losses, held to maturity securities |  |
Debt Securities, Held-to-maturity, Fair Value, Total | 3,665 | 3,680
Corporate Debt Securities [Member] |  |
Amortized cost, held to maturity securities | 1,500 | 1,500
Gross unrealized gains, held to maturity securities | 154 | 12
Gross unrealized losses, held to maturity securities |  |
Debt Securities, Held-to-maturity, Fair Value, Total | $ 1,654 | $ 1,512

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