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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, 2019	Dec. 31, 2018
Securities available for sale, amortized cost, due in one year or less	$ 18,773
Securities available for sale, fair value, due in one year or less	18,667
Securities available for sale, amortized cost, due after one year through five years	56,424
Securities available for sale, fair value, due after one year through five years	56,002
Securities available for sale, amortized cost, due after five years through ten years	32,260
Securities available for sale, fair value, due after five years through ten years	32,636
Securities available for sale, amortized cost, due after ten years	23,653
Securities available for sale, fair value, due after ten years	24,259
Securities available for sale, amortized cost, single maturity	131,110
Securities available for sale, fair value, single maturity	131,564
Securities available for sale, amortized cost, Mortgage-backed securities and CMO	126,095
Securities available for sale, fair value, Mortgage-backed securities and CMO	123,471
Securities available for sale, fair value	255,035	$ 261,841
Debt Securities [Member]
Securities available for sale, amortized cost	257,205
Securities available for sale, fair value	$ 255,035

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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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