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Note 3 - Investment Securities - Available-for-sale and Held-to-maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Available-for-sale, amortized cost	$ 160,138	$ 155,473
Available-for-sale, gross unrealized gains	358	495
Available-for-sale, gross unrealized losses	(3,854)	(2,097)
Available-for-sale, estimated fair value	156,642	153,871
Held-to-maturity, amortized cost	25,300	26,279
Held-to-maturity, gross unrealized gains		13
Held-to-maturity, gross unrealized losses	(613)	(343)
Investment securities held-to-maturity	24,687	25,949
Commercial Mortgage Backed Securities [Member]
Available-for-sale, amortized cost	67,846	67,281
Available-for-sale, gross unrealized gains	16	27
Available-for-sale, gross unrealized losses	(1,868)	(1,234)
Available-for-sale, estimated fair value	65,994	66,074
Held-to-maturity, amortized cost	14,237	15,065
Held-to-maturity, gross unrealized gains		1
Held-to-maturity, gross unrealized losses	(342)	(186)
Investment securities held-to-maturity	13,895	14,880
US Government Agencies Debt Securities [Member]
Held-to-maturity, amortized cost	9,209	9,326
Held-to-maturity, gross unrealized gains		7
Held-to-maturity, gross unrealized losses	(255)	(144)
Investment securities held-to-maturity	8,954	9,189
Residential Mortgage Backed Securities [Member]
Available-for-sale, amortized cost	87,463	83,360
Available-for-sale, gross unrealized gains	202	286
Available-for-sale, gross unrealized losses	(1,983)	(860)
Available-for-sale, estimated fair value	85,682	82,786
US States and Political Subdivisions Debt Securities [Member]
Available-for-sale, amortized cost	4,749	4,752
Available-for-sale, gross unrealized gains	140	182
Available-for-sale, gross unrealized losses	(3)	(3)
Available-for-sale, estimated fair value	4,886	4,931
Held-to-maturity, amortized cost	1,854	1,888
Held-to-maturity, gross unrealized gains		5
Held-to-maturity, gross unrealized losses	(16)	(13)
Investment securities held-to-maturity	1,838	1,880
US Treasury Securities [Member]
Available-for-sale, amortized cost	80	80
Available-for-sale, gross unrealized gains
Available-for-sale, gross unrealized losses
Available-for-sale, estimated fair value	$ 80	$ 80

X

- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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-Section 50
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+ References

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-Publisher FASB
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