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Note 2 - Securities - Summary of Amortized Costs and Fair Values of Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Amortized cost, available for sale securities | $ 118,980 | $ 120,068
Gross unrealized gains, available for sale securities | 4,215 | 1,254
Gross unrealized losses, available for sale securities | (2) | (339)
Fair value, available for sale securities | 123,193 | 120,983
Amortized cost, held to maturity securities | 16,211 | 17,627
Gross unrealized gains, held to maturity securities | 526 | 99
Gross unrealized losses, held to maturity securities | 0 | (80)
Debt Securities, Held-to-maturity, Fair Value, Total | 16,737 | 17,646
Amortized cost, total securities | 135,191 | 137,695
Gross unrealized gains, total securities | 4,741 | 1,353
Gross unrealized losses, total securities | (2) | (419)
Total securities | 139,930 | 138,629
US Agency and Mortgage-backed Securities [Member] |  |
Amortized cost, available for sale securities | 91,519 | 94,461
Gross unrealized gains, available for sale securities | 3,302 | 778
Gross unrealized losses, available for sale securities | (1) | (334)
Fair value, available for sale securities | 94,820 | 94,905
Amortized cost, held to maturity securities | 11,306 | 12,528
Gross unrealized gains, held to maturity securities | 299 | 6
Gross unrealized losses, held to maturity securities | 0 | (80)
Debt Securities, Held-to-maturity, Fair Value, Total | 11,605 | 12,454
Municipal Bonds [Member] |  |
Amortized cost, available for sale securities | 27,461 | 25,607
Gross unrealized gains, available for sale securities | 913 | 476
Gross unrealized losses, available for sale securities | (1) | (5)
Fair value, available for sale securities | 28,373 | 26,078
Amortized cost, held to maturity securities | 3,405 | 3,599
Gross unrealized gains, held to maturity securities | 138 | 81
Gross unrealized losses, held to maturity securities | 0 | 0
Debt Securities, Held-to-maturity, Fair Value, Total | 3,543 | 3,680
Corporate Debt Securities [Member] |  |
Amortized cost, held to maturity securities | 1,500 | 1,500
Gross unrealized gains, held to maturity securities | 89 | 12
Gross unrealized losses, held to maturity securities | 0 | 0
Debt Securities, Held-to-maturity, Fair Value, Total | $ 1,589 | $ 1,512

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