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Note 2 - Securities - Amortized Cost and Fair Value of Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Due within one year, amortized cost, available for sale securities	$ 2,544
Due within one year, fair value, available for sale securities	2,554
Due within one year, amortized cost, held to maturity securities	186
Due within one year, fair value, held to maturity securities	186
Due after one year through five years, amortized cost, available for sale securities	8,276
Due after one year through five years, fair value, available for sale securities	8,307
Due after one year through five years, amortized cost, held to maturity securities	4,345
Due after one year through five years, fair value, held to maturity securities	4,380
Due after five years through ten years, amortized cost, available for sale securities	28,325
Due after five years through ten years, fair value, available for sale securities	28,805
Due after five years through ten years, amortized cost, held to maturity securities	4,145
Due after five years through ten years, fair value, held to maturity securities	4,180
Due after ten years, amortized cost, available for sale securities	79,393
Due after ten years, fair value, available for sale securities	79,844
Due after ten years, amortized cost, held to maturity securities	10,152
Due after ten years, fair value, held to maturity securities	10,050
Amortized cost, available for sale securities	118,538
Fair value, available for sale securities	119,510
Securities held to maturity	18,828
Securities, fair value	$ 18,796	$ 42,394

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