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Note 7 - Provision for Income Taxes (Tables)
6 Months Ended
Jun. 30, 2014
Income Tax Disclosure [Abstract]  
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
   

For the three months ended
June 30,  

    For the six months ended
June 30,
  
 
   

2014

   

2013

   

2014

   

2013

 

Provision for income taxes

  $ 3,269     $ 10,498     $ 6,991     $ 16,604  

Effective tax rate

    37.9 %     36.6 %     37.6 %     34.0 %