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Note 2 - Securities - Amortized Cost and Fair Value of Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Due within one year, amortized cost, available for sale securities	$ 2,059
Due within one year, fair value, available for sale securities	2,070
Due within one year, amortized cost, held to maturity securities	436
Due within one year, fair value, held to maturity securities	437
Due after one year through five years, amortized cost, available for sale securities	6,336
Due after one year through five years, fair value, available for sale securities	6,350
Due after one year through five years, amortized cost, held to maturity securities	4,737
Due after one year through five years, fair value, held to maturity securities	4,794
Due after five years through ten years, amortized cost, available for sale securities	32,867
Due after five years through ten years, fair value, available for sale securities	33,427
Due after five years through ten years, amortized cost, held to maturity securities	3,334
Due after five years through ten years, fair value, held to maturity securities	3,351
Due after ten years, amortized cost, available for sale securities	78,806
Due after ten years, fair value, available for sale securities	79,136
Due after ten years, amortized cost, held to maturity securities	9,120
Due after ten years, fair value, held to maturity securities	9,064
Fair value, available for sale securities	120,068	$ 102,147
Securities available for sale, at fair value	120,983	99,857
Amortized cost, held to maturity securities	17,627
Securities, fair value	$ 17,646	$ 42,394

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