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Note 9 - Income Taxes (Tables)
3 Months Ended
Mar. 31, 2017
Notes Tables  
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
 
 
Three Months Ended March 31,
 
 
 
2017
 
 
2016
 
Income tax expense
  $
7,329     
    $
6,415     
 
Effective income tax rate
   
41.1%
     
41.6%