Note 7 - Loans and Allowance for Loan Losses (Details) - Activity in the Allowance for Loan Losses - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, beginning of period	$ 12,199	$ 17,123	$ 13,968	$ 20,577
Provision for loan losses	(898)	(1,536)	(2,707)	(2,792)
Recoveries	211	825	643	1,301
Loans charged off	(235)	(720)	(627)	(3,394)
Balance, end of period	11,277	15,692	11,277	15,692
Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, beginning of period	10,806	15,448	12,542	18,716
Provision for loan losses	(765)	(1,036)	(2,552)	(3,395)
Recoveries	38	114	376	471
Loans charged off	(151)	(436)	(438)	(1,702)
Balance, end of period	9,928	14,090	9,928	14,090
Commercial Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, beginning of period	1,057	1,338	1,153	1,409
Provision for loan losses	(136)	(496)	(237)	634
Recoveries	145	691	176	736
Loans charged off	(42)	(230)	(68)	(1,476)
Balance, end of period	1,024	1,303	1,024	1,303
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, beginning of period	336	337	273	452
Provision for loan losses	3	(4)	82	(31)
Recoveries	28	20	91	94
Loans charged off	(42)	(54)	(121)	(216)
Balance, end of period	$ 325	$ 299	$ 325	$ 299