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Note 7 - Loans (Detail) - Activity Within the Troubled Debt Resturing Loans (USD $) | 12 Months Ended | 3 Months Ended
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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

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- Definition Amount of investment in financing receivables (after modification) modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953676-111524 + Details
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- Definition Reflects the amount of the write-down related to a troubled debt restructuring. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6951948&loc=d3e18845-111554 + Details
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