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Note 6 - Stock-Based Compensation (Tables)
3 Months Ended
Mar. 31, 2013
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
   
Three Months Ended March 31,
 
   
2013
   
2012
 
   
Shares
   
Weighted-
Average
Exercise Price
   
Shares
   
Weighted-
Average E
xercise Price
 
                         
Beginning Balance
    652,064     $ 11.12       831,393     $ 11.19  
Issued
    3,000       22.03       -       -  
Exercised
    (47,717 )     9.80       (31,465 )     13.72  
Forfeited
    (300 )     6.34       -       -  
Expired
    (14,550 )     11.87       (26,655 )     15.32  
Ending Balance
    592,497     $ 11.26       773,273     $ 10.94  
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]
                     
Weighted-Average
 
Outstanding:
   
Stock Options
   
Weighted-Average
   
Remaining
 
Range of Exercise Prices
 
Outstanding
   
Exercise Price
   
Contractual Life
 
$ 6.34 - $7.45       238,008     $ 6.38       5.54  
$ 7.46 - $10.63       115,151       9.53       0.82  
$ 10.64 - $13.87       118,582       11.40       3.29  
$ 13.88 - $26.86       120,756       22.39       3.13  
                592,497     $ 11.26       3.68  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
   
Three Months Ended
   
Years Ended December 31,
 
   
March 31, 2013
   
2012
   
2011
 
Expected Volatility
    34.12 %     36.64 %     33.61 % - 36.64%  
Weighted-Average Volatility
    34.12 %     36.64 %     35.60%  
Expected Dividends
    0.0 %     0.0 %     0.0%  
Expected Term (In years)
    7.5       7.5       6.0 - 7.5  
Risk-Free Rate
    1.31 %     1.13 %     1.82%
Weighted-Average Fair Value (Grant date)
  $ 8.61     $ 6.99     $ 5.07
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]
   
Three Months Ended March 31,
 
   
2013
   
2012
 
   
Shares
   
Weighted-
Average Grant
Date Fair Value
   
Shares
   
Weighted-
Average Grant
Date Fair Value
 
                         
Unvested at Beginning
    316,686     $ 15.17       202,555     $ 11.67  
Issued
    383,142       22.70       243,767       16.83  
Forfeited
    -       -       (8,073 )     10.35  
Vested
    (140,636 )     14.37       (107,677 )     13.20  
Unvested at End
    559,192     $ 20.53       330,572     $ 15.01  
Exercisable Stock Options [Member]
 
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]
Exercisable:
   
Stock Options
   
Weighted-Average
         
Range of Exercise Prices
 
Exercisable
   
Exercise Price
         
$ 6.34 - $7.45       146,791     $ 6.41        
$ 7.46 - $10.63       113,901       9.53          
$ 10.64 - $13.87       92,567       11.23          
$ 13.88 - $26.86       112,756       22.64          
                466,015     $ 12.06