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Note 2 - Securities - Summary of Amortized Costs and Fair Values of Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Amortized cost, available for sale securities	$ 118,538	$ 102,147
Gross unrealized gains, available for sale securities	1,291	75
Gross unrealized losses, available for sale securities	(319)	(2,365)
Securities available for sale	119,510	99,857	[1]
Securities held to maturity, at amortized cost (fair value, 2019, $18,796; 2018, $42,394)	18,828	43,408	[1]
Gross unrealized gains, held to maturity securities	89	29
Gross unrealized losses, held to maturity securities	(121)	(1,043)
Securities, fair value	18,796	42,394
Gross unrealized losses, held to maturity securities	121	1,043
Amortized cost, total securities	137,366	145,555
Gross unrealized gains, total securities	1,380	104
Gross unrealized losses, total securities	(440)	(3,408)
Total securities	138,306	142,251
Securities held to maturity:
Securities held to maturity, at amortized cost (fair value, 2019, $18,796; 2018, $42,394)	18,828	43,408	[1]
Gross unrealized gains, held to maturity securities	89	29
Gross unrealized losses, held to maturity securities	(121)	(1,043)
Securities, fair value	18,796	42,394
Gross unrealized losses, held to maturity securities	121	1,043
Amortized cost, total securities	137,366	145,555
Gross unrealized gains, total securities	1,380	104
Gross unrealized losses, total securities	(440)	(3,408)
Total securities	138,306	142,251
US Agency and Mortgage-backed Securities [Member]
Amortized cost, available for sale securities	92,052	86,944
Gross unrealized gains, available for sale securities	935	44
Gross unrealized losses, available for sale securities	(304)	(2,066)
Securities available for sale	92,683	84,922
Securities held to maturity, at amortized cost (fair value, 2019, $18,796; 2018, $42,394)	13,721	27,420
Gross unrealized gains, held to maturity securities	10
Gross unrealized losses, held to maturity securities	(121)	(869)
Securities, fair value	13,610	26,551
Gross unrealized losses, held to maturity securities	121	869
Securities held to maturity:
Securities held to maturity, at amortized cost (fair value, 2019, $18,796; 2018, $42,394)	13,721	27,420
Gross unrealized gains, held to maturity securities	10
Gross unrealized losses, held to maturity securities	(121)	(869)
Securities, fair value	13,610	26,551
Gross unrealized losses, held to maturity securities	121	869
Municipal Bonds [Member]
Amortized cost, available for sale securities	26,486	15,203
Gross unrealized gains, available for sale securities	356	31
Gross unrealized losses, available for sale securities	(15)	(299)
Securities available for sale	26,827	14,935
Securities held to maturity, at amortized cost (fair value, 2019, $18,796; 2018, $42,394)	3,607	14,488
Gross unrealized gains, held to maturity securities	57	20
Gross unrealized losses, held to maturity securities		(174)
Securities, fair value	3,664	14,334
Gross unrealized losses, held to maturity securities		174
Securities held to maturity:
Securities held to maturity, at amortized cost (fair value, 2019, $18,796; 2018, $42,394)	3,607	14,488
Gross unrealized gains, held to maturity securities	57	20
Gross unrealized losses, held to maturity securities		(174)
Securities, fair value	3,664	14,334
Gross unrealized losses, held to maturity securities		174
Corporate Debt Securities [Member]
Securities held to maturity, at amortized cost (fair value, 2019, $18,796; 2018, $42,394)	1,500	1,500
Gross unrealized gains, held to maturity securities	22	9
Gross unrealized losses, held to maturity securities
Securities, fair value	1,522	1,509
Gross unrealized losses, held to maturity securities
Securities held to maturity:
Securities held to maturity, at amortized cost (fair value, 2019, $18,796; 2018, $42,394)	1,500	1,500
Gross unrealized gains, held to maturity securities	22	9
Gross unrealized losses, held to maturity securities
Securities, fair value	1,522	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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