Note 7 - Troubled Debt Restructuring Activity (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Accruing Troubled Debt Restructuring [Member]
Beginning balance	$ 90,172	$ 100,393	$ 81,680	$ 104,356
New restructurings	2,065	5,798	2,065	16,426
Restructured loans restored to accrual status			10,303
Charge-offs				(148)
Payments	(1,505)	(6,180)	(3,316)	(10,434)
Restructured loans placed on non-accrual status	(1,138)		(1,138)	(10,189)
Expiration of loan concession upon renewal	(14,886)		(14,886)
Ending balance	74,708	100,011	74,708	100,011
Non-accruing Troubled Debt Restructuring [Member]
Beginning balance	23,209	44,541	39,923	41,618
New restructurings	3,145		3,145	209
Restructured loans restored to accrual status	1,138		1,138	10,189
Charge-offs	(945)	(489)	(945)	(3,243)
Payments	(1,105)	(1,457)	(7,516)	(6,178)
Restructured loans placed on non-accrual status			(10,303)
Ending balance	$ 25,442	$ 42,595	25,442	42,595
Charge-offs			$ (171)	$ (83)