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Note 9 - Income Taxes (Tables)
3 Months Ended
Mar. 31, 2016
Notes Tables  
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
 
 
Three Months Ended March 31,
 
 
 
2016
 
 
2015
 
Income tax expense
  $ 6,415     $ 3,940  
Effective income tax rate
    41.6 %     41.3 %