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Note 3 - Investment Securities - Available-for-sale and Held-to-maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Available-for-sale, amortized cost	$ 158,676	$ 184,278
Available-for-sale, gross unrealized gains	772	936
Available-for-sale, gross unrealized losses	(1,023)	(3,304)
Available-for-sale, estimated fair value	158,425	181,910
Held-to-maturity, amortized cost	27,377	25,904
Held-to-maturity, gross unrealized gains	69	20
Held-to-maturity, gross unrealized losses	(143)	(416)
Held-to-maturity, estimated fair value	27,303	25,508
Residential Mortgage Backed Securities [Member]
Available-for-sale, amortized cost	83,391	99,922
Available-for-sale, gross unrealized gains	477	490
Available-for-sale, gross unrealized losses	(318)	(2,003)
Available-for-sale, estimated fair value	83,550	98,409
Commercial Mortgage Backed Securities [Member]
Available-for-sale, amortized cost	67,781	71,761
Available-for-sale, gross unrealized gains	62	56
Available-for-sale, gross unrealized losses	(705)	(1,287)
Available-for-sale, estimated fair value	67,138	70,530
Held-to-maturity, amortized cost	15,976	14,684
Held-to-maturity, gross unrealized gains	18	5
Held-to-maturity, gross unrealized losses	(61)	(148)
Held-to-maturity, estimated fair value	15,933	14,541
US Government Agencies Debt Securities [Member]
Available-for-sale, amortized cost	2,000	2,000
Available-for-sale, gross unrealized gains	2
Available-for-sale, gross unrealized losses		(7)
Available-for-sale, estimated fair value	2,002	1,993
Held-to-maturity, amortized cost	9,458	9,129
Held-to-maturity, gross unrealized gains	25	13
Held-to-maturity, gross unrealized losses	(79)	(222)
Held-to-maturity, estimated fair value	9,404	8,920
US States and Political Subdivisions Debt Securities [Member]
Available-for-sale, amortized cost	5,424	9,759
Available-for-sale, gross unrealized gains	231	390
Available-for-sale, gross unrealized losses		(7)
Available-for-sale, estimated fair value	5,655	10,142
Held-to-maturity, amortized cost	1,943	2,091
Held-to-maturity, gross unrealized gains	26	2
Held-to-maturity, gross unrealized losses	(3)	(46)
Held-to-maturity, estimated fair value	1,966	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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