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Note 2 - Securities - Amortized Cost and Fair Value of Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Due within one year, amortized cost, available for sale securities	$ 1,729
Due within one year, fair value, available for sale securities	1,738
Due within one year, amortized cost, held to maturity securities	440
Due within one year, fair value, held to maturity securities	443
Due after one year through five years, amortized cost, available for sale securities	13,001
Due after one year through five years, fair value, available for sale securities	13,512
Due after one year through five years, amortized cost, held to maturity securities	4,539
Due after one year through five years, fair value, held to maturity securities	4,682
Due after five years through ten years, amortized cost, available for sale securities	32,272
Due after five years through ten years, fair value, available for sale securities	33,578
Due after five years through ten years, amortized cost, held to maturity securities	4,370
Due after five years through ten years, fair value, held to maturity securities	4,557
Due after ten years, amortized cost, available for sale securities	71,978
Due after ten years, fair value, available for sale securities	74,365
Due after ten years, amortized cost, held to maturity securities	6,862
Due after ten years, fair value, held to maturity securities	7,055
Amortized cost, available for sale securities	118,980	$ 120,068
Fair value, available for sale securities	123,193	120,983
Amortized cost, held to maturity securities	16,211
Securities, fair value	$ 16,737	$ 17,646

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