Note 7 - Loans (Details) - Troubled Debt Restructuring Activity (USD $) In Thousands, unless otherwise specified			3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014 Accruing Troubled Debt Restructuring [Member]	Sep. 30, 2013 Accruing Troubled Debt Restructuring [Member]	Sep. 30, 2014 Accruing Troubled Debt Restructuring [Member]	Sep. 30, 2013 Accruing Troubled Debt Restructuring [Member]	Sep. 30, 2014 Non Accruing Troubled Debt Restructuring Member	Sep. 30, 2013 Non Accruing Troubled Debt Restructuring Member	Sep. 30, 2014 Non Accruing Troubled Debt Restructuring Member	Sep. 30, 2013 Non Accruing Troubled Debt Restructuring Member
Note 7 - Loans (Details) - Troubled Debt Restructuring Activity [Line Items]
Beginning balance	$ 34,162	$ 38,769	$ 111,136	$ 115,464	$ 117,597	$ 144,695	$ 43,605	$ 48,524	$ 38,769	$ 47,731
New restructurings			14,900	10,669	22,997	15,485	34	2,415	1,820	6,163
Restructured loans restored to accrual status			660	5,397	1,622	6,851	(660)	(5,397)	(1,622)	(6,851)
Charge-offs						(78)	(234)	(1,188)	(833)	(2,121)
Payments			(3,607)	(15,274)	(11,897)	(48,663)	(8,583)	(1,062)	(11,202)	(3,664)
Restructured loans placed on nonaccrual				(316)	(7,230)	(2,350)		316	7,230	2,350
Ending balance	$ 34,162	$ 38,769	$ 123,089	$ 115,940	$ 123,089	$ 115,940	$ 34,162	$ 43,608	$ 34,162	$ 43,608