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Note 3 - Investment Securities - Available-for-sale and Held-to-maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Available-for-sale, amortized cost	$ 155,473	$ 184,278
Available-for-sale, gross unrealized gains	495	936
Available-for-sale, gross unrealized losses	(2,097)	(3,304)
Available-for-sale, estimated fair value	153,871	181,910
Held-to-maturity, amortized cost	26,279	25,904
Held-to-maturity, gross unrealized gains	13	20
Held-to-maturity, gross unrealized losses	(343)	(416)
Held-to-maturity, estimated fair value	25,949	25,508
Residential Mortgage Backed Securities [Member]
Available-for-sale, amortized cost	83,360	99,922
Available-for-sale, gross unrealized gains	286	490
Available-for-sale, gross unrealized losses	(860)	(2,003)
Available-for-sale, estimated fair value	82,786	98,409
Commercial Mortgage Backed Securities [Member]
Available-for-sale, amortized cost	67,281	71,761
Available-for-sale, gross unrealized gains	27	56
Available-for-sale, gross unrealized losses	(1,234)	(1,287)
Available-for-sale, estimated fair value	66,074	70,530
Held-to-maturity, amortized cost	15,065	14,684
Held-to-maturity, gross unrealized gains	1	5
Held-to-maturity, gross unrealized losses	(186)	(148)
Held-to-maturity, estimated fair value	14,880	14,541
US Government Agencies Debt Securities [Member]
Available-for-sale, amortized cost		2,000
Available-for-sale, gross unrealized gains
Available-for-sale, gross unrealized losses		(7)
Available-for-sale, estimated fair value		1,993
Held-to-maturity, amortized cost	9,326	9,129
Held-to-maturity, gross unrealized gains	7	13
Held-to-maturity, gross unrealized losses	(144)	(222)
Held-to-maturity, estimated fair value	9,189	8,920
US States and Political Subdivisions Debt Securities [Member]
Available-for-sale, amortized cost	4,752	9,759
Available-for-sale, gross unrealized gains	182	390
Available-for-sale, gross unrealized losses	(3)	(7)
Available-for-sale, estimated fair value	4,931	10,142
Held-to-maturity, amortized cost	1,888	2,091
Held-to-maturity, gross unrealized gains	5	2
Held-to-maturity, gross unrealized losses	(13)	(46)
Held-to-maturity, estimated fair value	1,880	2,047
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
Corporate Debt Securities [Member]
Available-for-sale, amortized cost		756
Available-for-sale, gross unrealized gains
Available-for-sale, gross unrealized losses
Available-for-sale, estimated fair value		$ 756

X

- Definition

Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

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