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Note 2 - Investment Securities - Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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Securities available for sale, amortized cost, due in one year or less | $ 22,320 |
Securities available for sale, fair value, due in one year or less | 22,167 |
Securities available for sale, amortized cost, due after one year through five years | 58,207 |
Securities available for sale, fair value, due after one year through five years | 56,861 |
Securities available for sale, amortized cost, due after five years through ten years | 30,999 |
Securities available for sale, fair value, due after five years through ten years | 30,505 |
Securities available for sale, amortized cost, due after ten years | 18,644 |
Securities available for sale, fair value, due after ten years | 18,702 |
Securities available for sale, amortized cost, single maturity | 130,170 |
Securities available for sale, fair value, single maturity | 128,235 |
Securities available for sale, amortized cost, mortgage-backed securities and CMO | 128,462 |
Securities available for sale, fair value, mortgage-backed securities and CMO | 123,203 |
Securities available for sale, amortized cost | 258,632 | $ 273,878
Securities available for sale, fair value | 251,438 | $ 271,172
Debt Securities [Member] |  |
Securities available for sale, amortized cost | 258,632 |
Securities available for sale, fair value | $ 251,438 |

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