Note 7 - Loans (Detail) - Activity Within the Troubled Debt Resturing Loans (USD $)	12 Months Ended	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2013 Accruing Troubled Debt Restructuring Member	Mar. 31, 2012 Accruing Troubled Debt Restructuring Member	Mar. 31, 2013 Non Accruing Troubled Debt Restructuring Member	Mar. 31, 2012 Non Accruing Troubled Debt Restructuring Member
Beginning balance		$ 144,695,000	$ 120,016,000	$ 47,731,000	$ 50,870,000
New restructurings		4,816,000	21,712,000	2,062,000	5,238,000
Restructured loans restored to accrual status		630,000	2,853,000	(630,000)	(2,853,000)
Payments		(17,892,000)	(1,348,000)	(640,000)	(27,694,000)
Restructured loans placed on nonaccrual		(2,034,000)	0	2,034,000	0
Charge-offs	0			(679,000)	(4,018,000)
Ending balance		$ 130,215,000	$ 143,233,000	$ 49,878,000	$ 21,543,000