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Note 10 - Income Taxes (Detail) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Income Tax Expense (Benefit) $ 16,619,000 $ 10,906,000 $ 33,166,000 $ 22,640,000  
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate     36.10% 32.80%  
Income Tax Receivables, Total         39,300,000
Net Operating Loss For Two Thousand Nine To Two Thousand Seven Tax Years Member
         
Income Tax Receivables, Total         11,200,000
Low Income Housing Tax Credits For Two Thousand Nine To Two Thousand Eight Tax Years Member
         
Income Tax Receivables, Total         $ 9,100,000