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Note 9 - Income Taxes (Tables)
9 Months Ended
Sep. 30, 2016
Notes Tables  
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
 
 
Three Months Ended
 
 
Nine Months Ended
 
 
 
September 30,
 
 
September 30,
 
 
 
2016
 
 
2015
 
 
2016
 
 
2015
 
Income tax expense
  $ 797     $ 4,118     $ 19,109     $ 16,186  
Effective income tax rate
    136.5 %     38.4 %     42.0 %     40.0 %