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Note 13 - Stock-Based Compensation (Tables)
12 Months Ended
Dec. 31, 2013
Note 13 - Stock-Based Compensation (Tables) [Line Items]  
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
   

2013

   

2012

   

2011

 
   

Shares

   

Weighted-Average Exercise Price

   

Shares

   

Weighted-Average Exercise Price

   

Shares

   

Weighted-Average Exercise Price

 
                                                 

Beginning Balance

    722,155     $ 10.18       919,371     $ 10.23       1,099,306     $ 9.63  

Issued

    3,300       20.03       5,500       15.48       4,950       11.78  

Exercised

    (198,588 )     9.99       (167,882 )     10.01       (150,237 )     6.32  

Forfeited

    (2,420 )     7.40       (3,493 )     6.22       (17,952 )     6.57  

Expired

    (23,113 )     10.05       (31,341 )     13.92       (16,696 )     10.48  

Ending Balance

    501,334     $ 10.34       722,155     $ 10.18       919,371     $ 10.23  
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]

Outstanding:

Range of Exercise Prices

 

Stock Options Outstanding

   

Weighted-Average

Exercise Price

   

Weighted-Average Remaining Contractual Life

 

$5.76

- $8.00     242,770     $ 5.76       5.02  

$8.01

- $10.00     73,242       9.67       0.88  

$10.01

- $20.00     109,994       12.55       3.79  

$20.01

- $24.46     75,328       22.52       1.90  
          501,334     $ 10.34       3.68  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
   

Year Ended December 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)

  $ 7.83     $ 6.35       $4.61    
Schedule of Cash Proceeds Received from Share-based Payment Awards [Table Text Block]
   

Year Ended December 31,

 

(dollars in thousands)

 

2013

   

2012

   

2011

 
                         

Proceeds from stock options exercised

  $ 1,984     $ 1,685     $ 944  

Tax benefits related to stock options exercised

    410       369       143  

Intrinsic value of stock options exercised

    3,060       1,100       855  
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]
   

Year Ended December 31,

 
   

2013

   

2012

 
   

Shares

   

Weighted-Average Grant Date Fair Value

   

Shares

   

Weighted-Average Grant Date Fair Value

 
                                 

Unvested at Beginning

    348,353     $ 13.79       222,793     $ 10.61  

Issued

    424,450       20.64       268,115       15.30  

Forfeited

    (1,318 )     13.23       (15,051 )     11.05  

Vested

    (156,905 )     13.04       (127,504 )     11.73  

Unvested at End

    614,580     $ 18.71       348,353     $ 13.79  
Exercisable Stock Options [Member]
 
Note 13 - 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     143,147     $ 5.76          

$8.01

- $10.00     73,242       9.67          

$10.01

- $20.00     78,517       12.97          

$20.01

- $24.46     72,028       22.64          
          366,934     $ 11.40