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Note 4 - Investment Securities - Available-for-sale and Held-to-maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Available-for-sale, amortized cost	$ 141,100	$ 155,473
Available-for-sale, gross unrealized gains	191	495
Available-for-sale, gross unrealized losses	(4,033)	(2,097)
Available-for-sale, estimated fair value	137,258	153,871
Held-to-maturity, amortized cost	22,238	26,279
Held-to-maturity, gross unrealized gains		13
Held-to-maturity, gross unrealized losses	(759)	(343)
Held-to-maturity, estimated fair value	21,479	25,949
Commercial Mortgage Backed Securities [Member]
Available-for-sale, amortized cost	59,796	67,281
Available-for-sale, gross unrealized gains	11	27
Available-for-sale, gross unrealized losses	(2,091)	(1,234)
Available-for-sale, estimated fair value	57,716	66,074
Held-to-maturity, amortized cost	12,357	15,065
Held-to-maturity, gross unrealized gains		1
Held-to-maturity, gross unrealized losses	(408)	(186)
Held-to-maturity, estimated fair value	11,949	14,880
US Government Agencies Debt Securities [Member]
Held-to-maturity, amortized cost	8,126	9,326
Held-to-maturity, gross unrealized gains		7
Held-to-maturity, gross unrealized losses	(323)	(144)
Held-to-maturity, estimated fair value	7,803	9,189
Residential Mortgage Backed Securities [Member]
Available-for-sale, amortized cost	76,064	83,360
Available-for-sale, gross unrealized gains	144	286
Available-for-sale, gross unrealized losses	(1,897)	(860)
Available-for-sale, estimated fair value	74,311	82,786
US States and Political Subdivisions Debt Securities [Member]
Available-for-sale, amortized cost	5,160	4,752
Available-for-sale, gross unrealized gains	36	182
Available-for-sale, gross unrealized losses	(45)	(3)
Available-for-sale, estimated fair value	5,151	4,931
Held-to-maturity, amortized cost	1,755	1,888
Held-to-maturity, gross unrealized gains		5
Held-to-maturity, gross unrealized losses	(28)	(13)
Held-to-maturity, estimated fair value	1,727	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
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
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+ References

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+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-Section 50
-Paragraph 2
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Amount of 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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