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Note 2 - Securities - Summary of Amortized Costs and Fair Values of Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Amortized cost, available for sale securities | $ 112,923 | $ 120,068 |
Gross unrealized gains, available for sale securities | 4,223 | 1,254 |
Gross unrealized losses, available for sale securities | (14) | (339) |
Fair value, available for sale securities | 117,132 | 120,983 | [1]
Amortized cost, held to maturity securities | 15,101 | 17,627 | [1]
Gross unrealized gains, held to maturity securities | 537 | 99 |
Gross unrealized losses, held to maturity securities | 0 | (80) |
Debt Securities, Held-to-maturity, Fair Value, Total | 15,638 | 17,646 | [1]
Amortized cost, total securities | 128,024 | 137,695 |
Gross unrealized gains, total securities | 4,760 | 1,353 |
Gross unrealized losses, total securities | (14) | (419) |
Total securities | 132,770 | 138,629 |
US Agency and Mortgage-backed Securities [Member] |  |  |
Amortized cost, available for sale securities | 84,217 | 94,461 |
Gross unrealized gains, available for sale securities | 3,260 | 778 |
Gross unrealized losses, available for sale securities | (14) | (334) |
Fair value, available for sale securities | 87,463 | 94,905 |
Amortized cost, held to maturity securities | 10,450 | 12,528 |
Gross unrealized gains, held to maturity securities | 302 | 6 |
Gross unrealized losses, held to maturity securities | 0 | (80) |
Debt Securities, Held-to-maturity, Fair Value, Total | 10,752 | 12,454 |
Municipal Bonds [Member] |  |  |
Amortized cost, available for sale securities | 28,706 | 25,607 |
Gross unrealized gains, available for sale securities | 963 | 476 |
Gross unrealized losses, available for sale securities | 0 | (5) |
Fair value, available for sale securities | 29,669 | 26,078 |
Amortized cost, held to maturity securities | 3,151 | 3,599 |
Gross unrealized gains, held to maturity securities | 150 | 81 |
Gross unrealized losses, held to maturity securities | 0 | 0 |
Debt Securities, Held-to-maturity, Fair Value, Total | 3,301 | 3,680 |
Corporate Debt Securities [Member] |  |  |
Amortized cost, held to maturity securities | 1,500 | 1,500 |
Gross unrealized gains, held to maturity securities | 85 | 12 |
Gross unrealized losses, held to maturity securities | 0 | 0 |
Debt Securities, Held-to-maturity, Fair Value, Total | $ 1,585 | $ 1,512 |
[1] | Derived from audited consolidated financial statements.

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