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Note 2 - Investment Securities - Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Securities available for sale, amortized cost, due in one year or less	$ 20,481
Securities available for sale, fair value, due in one year or less	20,667
Securities available for sale, amortized cost, due after one year through five years	53,228
Securities available for sale, fair value, due after one year through five years	54,646
Securities available for sale, amortized cost, due after five years through ten years	32,411
Securities available for sale, fair value, due after five years through ten years	34,536
Securities available for sale, amortized cost, due after ten years	55,532
Securities available for sale, fair value, due after ten years	58,266
Securities available for sale, amortized cost, single maturity	161,652
Securities available for sale, fair value, single maturity	168,115
Mortgage-backed securities and CMO, amortized cost	94,247
Mortgage-backed securities and CMO, fair value	95,919
Securities available for sale, amortized cost	255,899	$ 251,819
Securities available for sale, fair value	$ 264,034	$ 254,562

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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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