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Note 10 - Income Taxes (Tables)
9 Months Ended
Sep. 30, 2015
Notes Tables  
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
 
 
Three Months Ended
 
 
Nine Months Ended
 
 
 
September 30,
 
 
September 30,
 
 
 
2015
 
 
2014
 
 
2015
 
 
2014
 
Income tax expense
  $ 4,118     $ 8,608     $ 16,186     $ 10,343  
Effective income tax rate
    38.4 %     38.2 %     40.0 %     38.1 %