Note 1 - Summary of Significant Accounting Policies (Details) - Net Income Per Common Share (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net Income Per Common Share [Abstract]
Net income, basic and diluted	$ 4,158	$ 4,107	$ 4,824	$ 3,370	$ 3,072	$ 3,035	$ 3,547	$ 3,792	$ 16,459	$ 13,446	$ 12,149
Less preferred stock dividends and discount accretion	377	450	563	537	490	489	487	485	1,927	1,951	1,922
Net income available to common shareholders, basic and diluted	$ 3,781	$ 3,657	$ 4,261	$ 2,833	$ 2,582	$ 2,546	$ 3,060	$ 3,307	$ 14,532	$ 11,495	$ 10,227
Average common shares outstanding, basic and diluted (in Shares)	7,487	7,485	7,482	7,479	7,477	7,475	7,473	7,470	7,483	7,474	7,457
Net income per common share, basic and diluted (in Dollars per share)	$ 0.51	$ 0.49	$ 0.57	$ 0.38	$ 0.35	$ 0.34	$ 0.41	$ 0.44	$ 1.94	$ 1.54	$ 1.37