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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, 2020	Dec. 31, 2019
Securities available for sale, amortized cost, due in one year or less	$ 25,243
Securities available for sale, fair value, due in one year or less	25,486
Securities available for sale, amortized cost, due after one year through five years	41,043
Securities available for sale, fair value, due after one year through five years	42,517
Securities available for sale, amortized cost, due after five years through ten years	28,058
Securities available for sale, fair value, due after five years through ten years	29,785
Securities available for sale, amortized cost, due after ten years	51,695
Securities available for sale, fair value, due after ten years	54,244
Securities available for sale, amortized cost, single maturity	146,039
Securities available for sale, fair value, single maturity	152,032
Securities available for sale, amortized cost	249,231	$ 251,819
Securities available for sale, fair value	257,099	$ 254,562
Debt Securities [Member]
Securities available for sale, amortized cost	249,231
Securities available for sale, fair value	$ 257,099

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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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