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Note 12 - Income Taxes (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Permanent Differences [Member]        
Unrecognized Tax Benefits, Period Increase (Decrease) $ 522,000 $ 460,000 $ 560,000 $ 557,000
Unrecognized Tax Benefits 5,239,000   5,239,000  
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued 2,203,000   2,203,000  
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit 1,218,000   1,218,000  
Deferred Tax Assets [Member]        
Unrecognized Tax Benefits 9,053,000   9,053,000  
Lapse of Statute of Limitations [Member]        
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit 2,705,000   2,705,000  
Temporary Difference [Member]        
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit 1,487,000   1,487,000  
Permanent and Temporary Differences [Member]        
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued 644,000   $ 644,000  
Earliest Tax Year [Member]        
Open Tax Year     2012  
Income Tax Expense (Benefit) $ 5,744,000 $ 5,844,000 $ 21,638,000 $ 22,028,000
Effective Income Tax Rate Reconciliation, Percent 31.40% 31.30% 36.20% 36.40%
Unrecognized Tax Benefits, Period Increase (Decrease) $ 183,000 $ 16,000 $ 513,000 $ 290,000
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations $ 1,715,000 $ 1,542,000 $ 1,715,000 $ 1,542,000
Income Tax Benefit as a Percentage of Income 9.40% 8.30% 2.90% 2.50%
Unrecognized Tax Benefits $ 14,292,000   $ 14,292,000  
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued 2,444,000   2,444,000  
Unrecognized Tax Benefits that Would Impact Effective Tax Rate $ 5,239,000   $ 5,239,000  
Income Tax Examination, Year under Examination     2012