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Note 2 - Securities - Summary of Amortized Costs and Fair Values of Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Securities available for sale:
Amortized cost, available for sale securities	$ 113,122	$ 102,147
Gross unrealized gains, available for sale securities	1,631	75
Gross unrealized losses, available for sale securities	(185)	(2,365)
Debt Securities, Available-for-sale, Total	114,568	99,857	[1]
Securities held to maturity:
Amortized cost, held to maturity securities	18,222	43,408	[1]
Gross unrealized gains, held to maturity securities	108	29
Gross unrealized losses, held to maturity securities	(71)	(1,043)
Debt Securities, Held-to-maturity, Fair Value, Total	18,259	42,394
Gross unrealized losses, held to maturity securities	71	1,043
Amortized cost, total securities	131,344	145,555
Gross unrealized gains, total securities	1,739	104
Gross unrealized losses, total securities	(256)	(3,408)
Total securities	132,827	142,251
US Agency and Mortgage-backed Securities [Member]
Securities available for sale:
Amortized cost, available for sale securities	87,004	86,944
Gross unrealized gains, available for sale securities	1,112	44
Gross unrealized losses, available for sale securities	(184)	(2,066)
Debt Securities, Available-for-sale, Total	87,932	84,922
Securities held to maturity:
Amortized cost, held to maturity securities	13,119	27,420
Gross unrealized gains, held to maturity securities	21
Gross unrealized losses, held to maturity securities	(71)	(869)
Debt Securities, Held-to-maturity, Fair Value, Total	13,069	26,551
Gross unrealized losses, held to maturity securities	71	869
Municipal Bonds [Member]
Securities available for sale:
Amortized cost, available for sale securities	26,118	15,203
Gross unrealized gains, available for sale securities	519	31
Gross unrealized losses, available for sale securities	(1)	(299)
Debt Securities, Available-for-sale, Total	26,636	14,935
Securities held to maturity:
Amortized cost, held to maturity securities	3,603	14,488
Gross unrealized gains, held to maturity securities	67	20
Gross unrealized losses, held to maturity securities		(174)
Debt Securities, Held-to-maturity, Fair Value, Total	3,670	14,334
Gross unrealized losses, held to maturity securities		174
Corporate Debt Securities [Member]
Securities held to maturity:
Amortized cost, held to maturity securities	1,500	1,500
Gross unrealized gains, held to maturity securities	20	9
Gross unrealized losses, held to maturity securities
Debt Securities, Held-to-maturity, Fair Value, Total	1,520	1,509
Gross unrealized losses, held to maturity securities
[1] Derived from audited consolidated financial statements.

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The total amount of available-for-sale and held-to-maturity debt securities measured at amortized cost.

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