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Note 11 - Earnings Per Share (Tables)
9 Months Ended
Sep. 30, 2014
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   

Three Months Ended

September 30,

   

Nine Months Ended

September 30,

 
   

2014

   

2013

   

2014

   

2013

 

Net Income

  $ 11,553     $ 11,131     $ 31,267     $ 31,574  
                                 

Weighted-average number of basic shares outstanding during the period

    19,450       19,802       19,682       19,685  

Dilutive effect of stock options, restricted stock and RSUs

    263       363       387       403  

Weighted-average number of diluted shares outstanding during the period

    19,713       20,165       20,069       20,088  
                                 

Basic earnings per share

  $ 0.59     $ 0.56     $ 1.59     $ 1.60  

Diluted earnings per share

  $ 0.59     $ 0.55     $ 1.56     $ 1.57