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Note 2 - Securities - Summary of Amortized Costs and Fair Values of Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Amortized cost, available for sale securities | $ 118,538 | $ 102,147 |
Gross unrealized gains, available for sale securities | 1,291 | 75 |
Gross unrealized losses, available for sale securities | (319) | (2,365) |
Securities available for sale | 119,510 | 99,857 | [1]
Securities held to maturity, at amortized cost (fair value, 2019, $18,796; 2018, $42,394) | 18,828 | 43,408 | [1]
Gross unrealized gains, held to maturity securities | 89 | 29 |
Gross unrealized losses, held to maturity securities | (121) | (1,043) |
Securities, fair value | 18,796 | 42,394 |
Gross unrealized losses, held to maturity securities | 121 | 1,043 |
Amortized cost, total securities | 137,366 | 145,555 |
Gross unrealized gains, total securities | 1,380 | 104 |
Gross unrealized losses, total securities | (440) | (3,408) |
Total securities | 138,306 | 142,251 |
Securities held to maturity: |  |  |
Securities held to maturity, at amortized cost (fair value, 2019, $18,796; 2018, $42,394) | 18,828 | 43,408 | [1]
Gross unrealized gains, held to maturity securities | 89 | 29 |
Gross unrealized losses, held to maturity securities | (121) | (1,043) |
Securities, fair value | 18,796 | 42,394 |
Gross unrealized losses, held to maturity securities | 121 | 1,043 |
Amortized cost, total securities | 137,366 | 145,555 |
Gross unrealized gains, total securities | 1,380 | 104 |
Gross unrealized losses, total securities | (440) | (3,408) |
Total securities | 138,306 | 142,251 |
US Agency and Mortgage-backed Securities [Member] |  |  |
Amortized cost, available for sale securities | 92,052 | 86,944 |
Gross unrealized gains, available for sale securities | 935 | 44 |
Gross unrealized losses, available for sale securities | (304) | (2,066) |
Securities available for sale | 92,683 | 84,922 |
Securities held to maturity, at amortized cost (fair value, 2019, $18,796; 2018, $42,394) | 13,721 | 27,420 |
Gross unrealized gains, held to maturity securities | 10 |  |
Gross unrealized losses, held to maturity securities | (121) | (869) |
Securities, fair value | 13,610 | 26,551 |
Gross unrealized losses, held to maturity securities | 121 | 869 |
Securities held to maturity: |  |  |
Securities held to maturity, at amortized cost (fair value, 2019, $18,796; 2018, $42,394) | 13,721 | 27,420 |
Gross unrealized gains, held to maturity securities | 10 |  |
Gross unrealized losses, held to maturity securities | (121) | (869) |
Securities, fair value | 13,610 | 26,551 |
Gross unrealized losses, held to maturity securities | 121 | 869 |
Municipal Bonds [Member] |  |  |
Amortized cost, available for sale securities | 26,486 | 15,203 |
Gross unrealized gains, available for sale securities | 356 | 31 |
Gross unrealized losses, available for sale securities | (15) | (299) |
Securities available for sale | 26,827 | 14,935 |
Securities held to maturity, at amortized cost (fair value, 2019, $18,796; 2018, $42,394) | 3,607 | 14,488 |
Gross unrealized gains, held to maturity securities | 57 | 20 |
Gross unrealized losses, held to maturity securities |  | (174) |
Securities, fair value | 3,664 | 14,334 |
Gross unrealized losses, held to maturity securities |  | 174 |
Securities held to maturity: |  |  |
Securities held to maturity, at amortized cost (fair value, 2019, $18,796; 2018, $42,394) | 3,607 | 14,488 |
Gross unrealized gains, held to maturity securities | 57 | 20 |
Gross unrealized losses, held to maturity securities |  | (174) |
Securities, fair value | 3,664 | 14,334 |
Gross unrealized losses, held to maturity securities |  | 174 |
Corporate Debt Securities [Member] |  |  |
Securities held to maturity, at amortized cost (fair value, 2019, $18,796; 2018, $42,394) | 1,500 | 1,500 |
Gross unrealized gains, held to maturity securities | 22 | 9 |
Gross unrealized losses, held to maturity securities |  |  |
Securities, fair value | 1,522 | 1,509 |
Gross unrealized losses, held to maturity securities |  |  |
Securities held to maturity: |  |  |
Securities held to maturity, at amortized cost (fair value, 2019, $18,796; 2018, $42,394) | 1,500 | 1,500 |
Gross unrealized gains, held to maturity securities | 22 | 9 |
Gross unrealized losses, held to maturity securities |  |  |
Securities, fair value | 1,522 | 1,509 |
Gross unrealized losses, held to maturity securities |  |  |
[1] | Derived from audited consolidated financial statements.

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