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Note 2 - Investment Securities - Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
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Securities available for sale, amortized cost, due in one year or less | $ 15,335 |
Securities available for sale, fair value, due in one year or less | 15,241 |
Securities available for sale, amortized cost, due after one year through five years | 64,630 |
Securities available for sale, fair value, due after one year through five years | 63,251 |
Securities available for sale, amortized cost, due after five years through ten years | 32,072 |
Securities available for sale, fair value, due after five years through ten years | 31,459 |
Securities available for sale, amortized cost, due after ten years | 29,656 |
Securities available for sale, fair value, due after ten years | 29,898 |
Securities available for sale, amortized cost, single maturity | 141,693 |
Securities available for sale, fair value, single maturity | 139,849 |
Securities available for sale, amortized cost, mortgage-backed securities and CMO | 129,810 |
Securities available for sale, fair value, mortgage-backed securities and CMO | 124,994 |
Securities available for sale, amortized cost | 271,503 | $ 273,878
Securities available for sale, fair value | 264,843 | $ 271,172
Debt Securities [Member] |  |
Securities available for sale, amortized cost | 271,503 |
Securities available for sale, fair value | $ 264,843 |

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