Note 5 - Loans (Details) - Troubled Debt Restructuring Activity - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accruing Troubled Debt Restructuring [Member]
Note 5 - Loans (Details) - Troubled Debt Restructuring Activity [Line Items]
Beginning balance	$ 104,356	$ 117,597	$ 144,695
New restructurings	17,752	23,740	21,382
Restructured loans restored to accrual status	723	962	6,851
Charge-offs	(104)		(78)
Payments	(30,858)	(13,256)	(52,362)
Restructured loans placed on nonaccrual	(10,189)	(24,687)	(2,891)
Ending balance	81,680	104,356	117,597
Non Accruing Troubled Debt Restructuring [Member]
Note 5 - Loans (Details) - Troubled Debt Restructuring Activity [Line Items]
Beginning balance	41,618	38,769	47,731
New restructurings	2,006	1,331	6,226
Restructured loans restored to accrual status	(723)	(962)	(6,851)
Charge-offs	(3,246)	(8,937)	(2,124)
Payments	(9,921)	(11,710)	(4,295)
Foreclosures		(1,560)	(4,809)
Restructured loans placed on nonaccrual	10,189	24,687	2,891
Ending balance	$ 39,923	$ 41,618	$ 38,769