Note 21 - Quarterly Financial Data - Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended										12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016		Jun. 30, 2016	Mar. 31, 2016		Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Interest income	$ 14,449	$ 14,619		$ 14,973	$ 15,330		$ 15,172	$ 15,123	$ 15,721	$ 15,220	$ 59,371	$ 61,236	$ 64,352
Interest expense	928	1,809		1,975	2,043		2,118	2,158	2,148	2,217	6,755	8,641	10,153
Net interest income	13,521	12,810		12,998	13,287		13,054	12,965	13,573	13,003	52,616	52,595	54,199
Provision for loan losses	175	(190)		(156)	(473)		(722)	(898)	(264)	(1,545)	(644)	(3,429)	(4,364)
Net interest income after provision for loan losses	13,346	13,000		13,154	13,760		13,776	13,863	13,837	14,548	53,260	56,024	58,563
Noninterest income	5,351	10,772	[1]	5,521	9,542	[2]	5,573	5,689	5,508	5,441	31,186	22,211	23,273
Noninterest expense	15,221	17,888	[1]	13,884	14,407		14,685	14,281	14,474	14,510	61,400	57,950	59,278
Income before income tax benefit and equity in undistributed income of subsidiaries	3,476	5,884		4,791	8,895		4,664	5,271	4,871	5,479
Income tax expense	931	1,560		1,235	2,715		1,080	1,439	1,369	1,405	6,441	5,293	6,099
Net income	2,545	4,324		3,556	6,180		3,584	3,832	3,502	4,074	16,605	14,992	16,459
Less preferred stock dividends and discount accretion									170	225		395	1,927
Net income available to common shareholders, basic and diluted	$ 2,545	$ 4,324		$ 3,556	$ 6,180		$ 3,584	$ 3,832	$ 3,332	$ 3,849	$ 16,605	$ 14,597	$ 14,532
Net income per common share, basic and diluted (in dollars per share)	$ 0.34	$ 0.58		$ 0.47	$ 0.82		$ 0.48	$ 0.51	$ 0.44	$ 0.51	$ 2.21	$ 1.95	$ 1.94
Weighted average common shares outstanding, basic and diluted (in shares)	7,508	7,505		7,502	7,500		7,497	7,495	7,492	7,490	7,504	7,494	7,483

[1] Noninterest income includes $3.8 million of gain on the sale of investment securities and noninterest expense includes $3.8 million of loss on the early extinguishment of debt, both related to a series of transactions to deleverage the balance sheet.

[2] Noninterest income includes $4.1 million related to the gain on the early extinguishment of subordinated notes payable.