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Note 9 - Stock-Based Compensation (Tables)
9 Months Ended
Sep. 30, 2014
Note 9 - Stock-Based Compensation (Tables) [Line Items]  
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
   

Nine Months Ended September 30,

 
   

2014

   

2013

 
   

Shares

   

Weighted-

Average

Exercise Price

   

Shares

   

Weighted-

Average

Exercise Price

 
                                 

Beginning Balance

    501,334     $ 10.34       722,155     $ 10.18  

Issued

    21,000       32.77       3,300       20.03  

Exercised

    (64,926 )     16.78       (117,791 )     10.58  

Forfeited

    (110 )     5.76       (2,090 )     7.65  

Expired

    (1,225 )     9.00       (23,113 )     10.05  

Ending Balance

    456,073     $ 10.46       582,461     $ 10.17  
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

 

$5.76 - $8.00

    236,369     $ 5.76       4.25  

$8.01 - $10.00

    54,807       9.91       0.27  

$10.01 - $20.00

    109,994       12.55       3.02  

$20.01 - $33.44

    54,903       27.06       4.78  
      456,073     $ 10.46       3.54  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
   

Nine Months Ended

   

Years Ended December 31,

 
   

September 30, 2014

   

2013

   

2012

 

Expected Volatility

    34.25 %     34.12 %     36.64 %

Weighted-Average Volatility

    34.24 %     34.12 %     36.64 %

Expected Dividends

    0.0 %     0.0 %     0.0 %

Expected Term (In years)

    7.5       7.5       7.5  

Risk-Free Rate

    2.11 %     1.31 %     1.13 %

Weighted-Average Fair Value (Grant date)

  $ 13.49     $ 7.83     $ 6.35  
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]
   

Nine Months Ended September 30,

 
   

2014

   

2013

 
   

Shares

   

Weighted-

Average Grant

Date Fair Value

   

Shares

   

Weighted-

Average Grant

Date Fair Value

 
                                 

Unvested at Beginning

    614,580     $ 18.71       348,350     $ 13.79  

Issued

    78,947       33.24       424,450       20.64  

Forfeited

    (8,250 )     25.28       (933 )     15.68  

Vested

    (184,921 )     17.54       (156,902 )     13.04  

Unvested at End

    500,356     $ 21.33       614,965     $ 18.71  
Exercisable Stock Options [Member]
 
Note 9 - Stock-Based Compensation (Tables) [Line Items]  
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

         

$5.76 - $8.00

    179,459     $ 5.76          

$8.01 - $10.00

    54,807       9.91          

$10.01 - $20.00

    89,656       12.77          

$20.01 - $33.44

    31,263       23.82          
      355,185     $ 9.76