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Note 4 - Investment Securities - Available-for-sale and Held-to-maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Available-for-sale, amortized cost	$ 129,232	$ 135,656
Available-for-sale, gross unrealized gains	258	174
Available-for-sale, gross unrealized losses	(2,305)	(3,343)
Available-for-sale, estimated fair value	127,185	132,487
Held-to-maturity, amortized cost	20,840	21,462	$ 20,840
Held-to-maturity, gross unrealized gains			6
Held-to-maturity, gross unrealized losses		(610)	(379)
Held-to-maturity, estimated fair value	20,467	20,852	20,467
Commercial Mortgage Backed Securities [Member]
Available-for-sale, amortized cost	52,786	56,101
Available-for-sale, gross unrealized gains	11	10
Available-for-sale, gross unrealized losses	(1,276)	(1,822)
Available-for-sale, estimated fair value	51,521	54,289
Held-to-maturity, amortized cost		11,716	11,143
Held-to-maturity, gross unrealized gains
Held-to-maturity, gross unrealized losses		(349)	(229)
Held-to-maturity, estimated fair value		11,367	10,914
US Government Agencies Debt Securities [Member]
Held-to-maturity, amortized cost		8,026	8,010
Held-to-maturity, gross unrealized gains
Held-to-maturity, gross unrealized losses		(244)	(145)
Held-to-maturity, estimated fair value		7,782	7,865
Residential Mortgage Backed Securities [Member]
Available-for-sale, amortized cost	70,759	73,859
Available-for-sale, gross unrealized gains	173	113
Available-for-sale, gross unrealized losses	(1,027)	(1,517)
Available-for-sale, estimated fair value	69,905	72,455
US States and Political Subdivisions Debt Securities [Member]
Available-for-sale, amortized cost	5,608	5,617
Available-for-sale, gross unrealized gains	74	51
Available-for-sale, gross unrealized losses	(1)	(4)
Available-for-sale, estimated fair value	5,681	5,664
Held-to-maturity, amortized cost		1,720	1,687
Held-to-maturity, gross unrealized gains			6
Held-to-maturity, gross unrealized losses		(17)	(5)
Held-to-maturity, estimated fair value		1,703	$ 1,688
US Treasury Securities [Member]
Available-for-sale, amortized cost	79	79
Available-for-sale, gross unrealized gains
Available-for-sale, gross unrealized losses	(1)
Available-for-sale, estimated fair value	$ 78	$ 79

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).

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