Note 5 - Loans (Details) - Troubled Debt Restructuring Activity (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Note 5 - Loans (Details) - Troubled Debt Restructuring Activity [Line Items]
New restructurings	$ 13,300,000
Accruing Troubled Debt Restructuring [Member]
Note 5 - Loans (Details) - Troubled Debt Restructuring Activity [Line Items]
Beginning balance	117,597,000	144,695,000	120,016,000
New restructurings	23,740,000	21,382,000	53,958,000
Restructured loans restored to accrual status	962,000	6,851,000	8,356,000
Charge-offs		(78,000)	(251,000)
Payments	(13,256,000)	(52,362,000)	(5,159,000)
Restructured loans placed on nonaccrual	(24,687,000)	(2,891,000)	(32,225,000)
Ending balance	104,356,000	117,597,000	144,695,000
Non Accruing Troubled Debt Restructuring [Member]
Note 5 - Loans (Details) - Troubled Debt Restructuring Activity [Line Items]
Beginning balance	38,769,000	47,731,000	50,870,000
New restructurings	1,331,000	6,226,000	12,304,000
Restructured loans restored to accrual status	(962,000)	(6,851,000)	(8,356,000)
Charge-offs	(8,937,000)	(2,124,000)	(4,182,000)
Payments	(11,710,000)	(4,295,000)	(33,931,000)
Foreclosures	(1,560,000)	(4,809,000)	(1,199,000)
Restructured loans placed on nonaccrual	24,687,000	2,891,000	32,225,000
Ending balance	$ 41,618,000	$ 38,769,000	$ 47,731,000