Note 21 - Quarterly Financial Data (Unaudited) (Details) - Quarterly Financial Data (Unaudited) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Quarterly Financial Data (Unaudited) [Abstract]
Interest income	$ 15,172	$ 15,123	$ 15,721	$ 15,220	$ 15,671	$ 15,976	$ 16,331	$ 16,374	$ 61,236	$ 64,352	$ 66,733
Interest expense	2,118	2,158	2,148	2,217	2,341	2,513	2,604	2,695	8,641	10,153	11,995
Net interest income	13,054	12,965	13,573	13,003	13,330	13,463	13,727	13,679	52,595	54,199	54,738
Provision for loan losses	(722)	(898)	(264)	(1,545)	(1,572)	(1,536)	(1,388)	132
Net interest income after provision for loan losses	13,776	13,863	13,837	14,548	14,902	14,999	15,115	13,547	56,024	58,563	57,338
Noninterest income	5,573	5,689	5,508	5,441	5,767	6,142	5,991	5,373	22,211	23,273	22,116
Noninterest expense	14,685	14,281	14,474	14,510	14,774	15,751	14,323	14,430	57,950	59,278	61,573
Income before income taxes	4,664	5,271	4,871	5,479	5,895	5,390	6,783	4,490	20,285	22,558	17,881
Income tax expense	1,080	1,439	1,369	1,405	1,737	1,283	1,959	1,120	5,293	6,099	4,435
Net income	3,584	3,832	3,502	4,074	4,158	4,107	4,824	3,370	14,992	16,459	13,446
Less preferred stock dividends and discount accretion	0	0	170	225	377	450	563	537	395	1,927	1,951
Net income available to common shareholders	$ 3,584	$ 3,832	$ 3,332	$ 3,849	$ 3,781	$ 3,657	$ 4,261	$ 2,833	$ 14,597	$ 14,532	$ 11,495
Net income per common share, basic and diluted (in Dollars per share)	$ 0.48	$ 0.51	$ 0.44	$ 0.51	$ 0.51	$ 0.49	$ 0.57	$ 0.38	$ 1.95	$ 1.94	$ 1.54
Weighted average common shares outstanding, basic and diluted (in Shares)	7,497	7,495	7,492	7,490	7,487	7,485	7,482	7,479	7,494	7,483	7,474