Note 7 - Loans and Allowance for Loan Losses (Details) - Activity in the Allowance for Loan Losses - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, beginning of period	$ 12,606	$ 18,690	$ 13,968	$ 20,577
Provision for loan losses	(264)	(1,388)	(1,809)	(1,256)
Recoveries	93	246	432	476
Loans charged off	(236)	(425)	(392)	(2,674)
Balance, end of period	12,199	17,123	12,199	17,123
Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, beginning of period	11,522	17,114	12,542	18,716
Provision for loan losses	(576)	(1,603)	(1,787)	(2,359)
Recoveries	52	189	338	357
Loans charged off	(192)	(252)	(287)	(1,266)
Balance, end of period	10,806	15,448	10,806	15,448
Commercial Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, beginning of period	866	1,201	1,153	1,409
Provision for loan losses	189	205	(101)	1,130
Recoveries	15	18	31	45
Loans charged off	(13)	(86)	(26)	(1,246)
Balance, end of period	1,057	1,338	1,057	1,338
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, beginning of period	218	375	273	452
Provision for loan losses	123	10	79	(27)
Recoveries	26	39	63	74
Loans charged off	(31)	(87)	(79)	(162)
Balance, end of period	$ 336	$ 337	$ 336	$ 337