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Note 8 - Income Taxes (Tables)
9 Months Ended
Sep. 30, 2011
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
   
Quarters Ended
September 30,
   
Nine Months Ended
September 30,
 
   
2011
   
2010
   
2011
   
2010
 
Income (loss) before income tax expense (benefit)
  $ 10,820     $ (1,387 )   $ 34,737     $ 14,997  
Income tax expense (benefit):
                               
Federal income tax expense (benefit)
  $ 909     $ (3,610 )   $ 3,592     $ (3,892 )
State income tax expense (benefit)
    795       (362 )     983       414  
Total income tax expense (benefit)
  $ 1,704     $ (3,972 )   $ 4,575     $ (3,478 )
Effective income tax rate
    15.7 %     N/M       13.2 %     N/M