Note 2 - Investment Securities - Investment Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Securities available for sale, amortized cost	$ 275,073	$ 259,456
Securities available for sale, gross unrealized gains	994	913
Securities available for sale, gross unrealized losses	3,882	4,525
Securities available for sale, at fair value	272,185	255,844
Securities-held to maturity	2	2
Securities held to maturity, gross unrealized gains	0	0
Securities held to maturity, gross unrealized losses	0	0
Securities held to maturity, fair value	2	2
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Securities available for sale, amortized cost	120,354	110,493
Securities available for sale, gross unrealized gains	76	93
Securities available for sale, gross unrealized losses	1,999	2,349
Securities available for sale, at fair value	118,431	108,237
Securities-held to maturity	2	2
Securities held to maturity, gross unrealized gains	0	0
Securities held to maturity, gross unrealized losses	0	0
Securities held to maturity, fair value	2	2
Agency Collateralized Mortgage Obligations [Member]
Securities available for sale, amortized cost	15,452	16,293
Securities available for sale, gross unrealized gains	18	23
Securities available for sale, gross unrealized losses	264	288
Securities available for sale, at fair value	15,206	16,028
US Government Agencies Debt Securities [Member]
Securities available for sale, amortized cost	70,778	69,407
Securities available for sale, gross unrealized gains	6	14
Securities available for sale, gross unrealized losses	695	759
Securities available for sale, at fair value	70,089	68,662
Municipal Notes [Member]
Securities available for sale, amortized cost	68,416	63,189
Securities available for sale, gross unrealized gains	894	783
Securities available for sale, gross unrealized losses	924	1,129
Securities available for sale, at fair value	68,386	62,843
Debt Securities [Member]
Securities available for sale, amortized cost	275,000	259,382
Securities available for sale, gross unrealized gains	994	913
Securities available for sale, gross unrealized losses	3,882	4,525
Securities available for sale, at fair value	272,112	255,770
Securities-held to maturity	2
Securities held to maturity, fair value	2
Mutual Funds [Member]
Securities available for sale, amortized cost	73	74
Securities available for sale, gross unrealized gains	0	0
Securities available for sale, gross unrealized losses	0	0
Securities available for sale, at fair value	$ 73	$ 74

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
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