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Note 3 - Investment Securities - Available-for-sale and Held-to-maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Available-for-sale, amortized cost	$ 145,315	$ 155,473
Available-for-sale, gross unrealized gains	173	495
Available-for-sale, gross unrealized losses	(4,067)	(2,097)
Available-for-sale, estimated fair value	141,421	153,871
Held-to-maturity, amortized cost	24,319	26,279
Held-to-maturity, gross unrealized gains		13
Held-to-maturity, gross unrealized losses	(704)	(343)
Held-to-maturity, estimated fair value	23,615	25,949
Commercial Mortgage Backed Securities [Member]
Available-for-sale, amortized cost	63,674	67,281
Available-for-sale, gross unrealized gains	13	27
Available-for-sale, gross unrealized losses	(2,068)	(1,234)
Available-for-sale, estimated fair value	61,619	66,074
Held-to-maturity, amortized cost	13,410	15,065
Held-to-maturity, gross unrealized gains		1
Held-to-maturity, gross unrealized losses	(399)	(186)
Held-to-maturity, estimated fair value	13,011	14,880
US Government Agencies Debt Securities [Member]
Held-to-maturity, amortized cost	9,110	9,326
Held-to-maturity, gross unrealized gains		7
Held-to-maturity, gross unrealized losses	(283)	(144)
Held-to-maturity, estimated fair value	8,827	9,189
Residential Mortgage Backed Securities [Member]
Available-for-sale, amortized cost	80,551	83,360
Available-for-sale, gross unrealized gains	134	286
Available-for-sale, gross unrealized losses	(1,997)	(860)
Available-for-sale, estimated fair value	78,688	82,786
US States and Political Subdivisions Debt Securities [Member]
Available-for-sale, amortized cost	1,010	4,752
Available-for-sale, gross unrealized gains	26	182
Available-for-sale, gross unrealized losses	(2)	(3)
Available-for-sale, estimated fair value	1,034	4,931
Held-to-maturity, amortized cost	1,799	1,888
Held-to-maturity, gross unrealized gains		5
Held-to-maturity, gross unrealized losses	(22)	(13)
Held-to-maturity, estimated fair value	1,777	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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-Publisher FASB
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-Section 50
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+ References

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+ References

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-Publisher FASB
-Name Accounting Standards Codification
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