Note 7 - Loans (Details) - Troubled Debt Restructuring Activity (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Accruing Troubled Debt Restructuring [Member]
Note 7 - Loans (Details) - Troubled Debt Restructuring Activity [Line Items]
Beginning balance	$ 104,356,000	$ 117,597,000
New restructurings	10,628,000	7,375,000
Restructured loans restored to accrual status		962,000
Charge-offs	(148,000)
Payments	(4,254,000)	(7,012,000)
Restructured loans placed on nonaccrual	(10,189,000)
Ending balance	100,393,000	118,922,000
Non Accruing Troubled Debt Restructuring [Member]
Note 7 - Loans (Details) - Troubled Debt Restructuring Activity [Line Items]
Beginning balance	41,618,000	38,769,000
New restructurings	209,000	1,539,000
Restructured loans restored to accrual status		(962,000)
Charge-offs	(2,754,000)	(4,000)
Payments	(4,721,000)	(1,545,000)
Restructured loans placed on nonaccrual	10,189,000
Ending balance	$ 44,541,000	$ 37,797,000