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Note 2 - Securities - Amortized Cost and Fair Value of Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Due within one year, amortized cost, available for sale securities	$ 201
Due within one year, fair value, available for sale securities	202
Due within one year, amortized cost, held to maturity securities	392
Due within one year, fair value, held to maturity securities	394
Due after one year through five years, amortized cost, available for sale securities	13,608
Due after one year through five years, fair value, available for sale securities	14,152
Due after one year through five years, amortized cost, held to maturity securities	6,043
Due after one year through five years, fair value, held to maturity securities	6,293
Due after five years through ten years, amortized cost, available for sale securities	38,483
Due after five years through ten years, fair value, available for sale securities	39,790
Due after five years through ten years, amortized cost, held to maturity securities	2,287
Due after five years through ten years, fair value, held to maturity securities	2,377
Due after ten years, amortized cost, available for sale securities	84,063
Due after ten years, fair value, available for sale securities	86,081
Due after ten years, amortized cost, held to maturity securities	5,512
Due after ten years, fair value, held to maturity securities	5,679
Amortized cost, available for sale securities	136,355	$ 120,068
Fair value, available for sale securities	140,225	120,983
Amortized cost, held to maturity securities	14,234
Securities, fair value	$ 14,743	$ 17,646

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