Note 5 - Loans (Detail) - Activity Within the Troubled Debt Resturing Loans (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
New restructurings	$ 24,700,000
Charge-offs	46,000
Accruing Troubled Debt Restructuring Member
Beginning balance	120,016,000	136,800,000
New restructurings	53,958,000	60,863,000
Restructured loans restored to accrual status	8,356,000	709,000
Charge-offs	(251,000)	(2,341,000)
Payments	(5,159,000)	(46,313,000)
Restructured loans placed on nonaccrual	(32,225,000)	(28,969,000)
Expiration of loan concession		(733,000)
Ending balance	144,695,000	120,016,000
Non Accruing Troubled Debt Restructuring Member
Beginning balance	50,870,000	28,146,000
New restructurings	12,304,000	13,269,000
Restructured loans restored to accrual status	(8,356,000)	(709,000)
Charge-offs	(4,182,000)	(7,303,000)
Payments	(33,931,000)	(3,355,000)
Foreclosures	(1,199,000)	(8,147,000)
Restructured loans placed on nonaccrual	32,225,000	28,969,000
Ending balance	$ 47,731,000	$ 50,870,000