Note 7 - Loans (Details) - Troubled Debt Restructuring Activity - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Accruing Troubled Debt Restructuring [Member]
Note 7 - Loans (Details) - Troubled Debt Restructuring Activity [Line Items]
Beginning balance	$ 81,680	$ 104,356
New restructurings		10,628
Restructured loans restored to accrual status	10,303
Charge-offs		(148)
Payments	(1,811)	(4,254)
Restructured loans placed on nonaccrual		(10,189)
Ending balance	90,172	100,393
Non Accruing Troubled Debt Restructuring [Member]
Note 7 - Loans (Details) - Troubled Debt Restructuring Activity [Line Items]
Beginning balance	39,923	41,618
New restructurings		209
Restructured loans restored to accrual status	(10,303)
Charge-offs		(2,754)
Payments	(6,411)	(4,721)
Restructured loans placed on nonaccrual		10,189
Ending balance	$ 23,209	$ 44,541