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Note 7 - Provision for Income Taxes (Tables)
3 Months Ended
Mar. 31, 2014
Income Tax Disclosure [Abstract]  
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
   

For the three months

ended March 31,

 
   

2014

   

2013

 

Provision for income taxes

  $ 3,722     $ 6,106  

Effective tax rate

    37.2 %     30.3 %