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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
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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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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