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Note 2 - Securities - Amortized Cost and Fair Value of Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Due within one year, amortized cost, available for sale securities	$ 2,155
Due within one year, fair value, available for sale securities	2,165
Due within one year, amortized cost, held to maturity securities	436
Due within one year, fair value, held to maturity securities	436
Due after one year through five years, amortized cost, available for sale securities	9,982
Due after one year through five years, fair value, available for sale securities	10,265
Due after one year through five years, amortized cost, held to maturity securities	4,733
Due after one year through five years, fair value, held to maturity securities	4,820
Due after five years through ten years, amortized cost, available for sale securities	34,741
Due after five years through ten years, fair value, available for sale securities	35,983
Due after five years through ten years, amortized cost, held to maturity securities	3,263
Due after five years through ten years, fair value, held to maturity securities	3,471
Due after ten years, amortized cost, available for sale securities	78,219
Due after ten years, fair value, available for sale securities	80,247
Due after ten years, amortized cost, held to maturity securities	8,654
Due after ten years, fair value, held to maturity securities	8,899
Amortized cost, available for sale securities	125,097	$ 120,068
Fair value, available for sale securities	128,660	120,983
Amortized cost, held to maturity securities	17,086
Securities, fair value	$ 17,626	$ 17,646

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