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Note 10 - Stock Based Compensation (Tables)
12 Months Ended
Dec. 31, 2013
Note 10 - Stock Based Compensation (Tables) [Line Items]  
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]
   

Non-vested

stock grants

   

Weighted average

grant date fair value

 

Balance, December 31, 2012

    651,943     $ 13.35  

Granted

    239,324       43.13  

Vested

    (185,462 )     7.97  

Forfeited

    (28,447 )     19.12  

Balance, December 31, 2013

    677,358     $ 25.10  
Schedule of Percentage of Granted RSUs Earned Based on Attainment Thresholds [Table Text Block]
   

Adjusted earnings

per share

attainment level

 

 

 

% of earned RSUs

 

Less than minimum

 

$0.00

or negative      0 %

Minimum

  $0.01       30  

Median

  $3.21       60  

Maximum

  $3.53       100  
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
   

Shares subject

to options

   

Weighted average

exercise price

   

Aggregate intrinsic value (millions)

   

Weighted average

remaining contractual term

(years)

 

Balance, December 31, 2012

    253,499     $ 6.26                  

Granted

    -       -                  

Forfeited

    -       -                  

Expired

    -       -                  

Exercised

    (194,615 )     6.17                  

Balance, December 31, 2013

    58,884     $ 6.53     $ 3.7       0.7  

Exercisable, December 31, 2013

    58,884     $ 6.53     $ 3.7       0.7  
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block]

Year Ended December 31,

 

2013

   

2012

   

2011

 

Weighted average grant-date fair value per share of stock options granted

  $ -     $ -     $ -  

Per share intrinsic value of non-vested stock granted

    43.13       23.82       13.58  

Weighted average per share discount for compensation expense recognized under the 2009 ESPP

    8.81       4.29       2.56  

Total intrinsic value of stock options exercised (millions)

    8.7       7.2       1.5  

Fair value of non-vested stock that vested during the period (millions)

    8.4       3.5       0.7  

Stock-based compensation recognized in results of operations, as a component of selling, general and administrative expense - excludes compensation expense related to an option granted to one of our executives. See Note 16. (millions)

    6.6       3.1       2.3  

Tax benefit recognized in Consolidated Statements of Operations (millions)

    2.3       1.0       0.7  

Cash received from options exercised and shares purchased under all share-based arrangements (millions)

    5.2       8.8       5.8  

Tax deduction realized related to stock options exercised (millions)

    6.5       4.1       0.9  
Executive Officer [Member]
 
Note 10 - Stock Based Compensation (Tables) [Line Items]  
Schedule of Percentage of Granted RSUs Earned Based on Attainment Thresholds [Table Text Block]

Adjusted fiscal earnings

per share

attainment level

   

% of earned RSUs

 
  $4.00       33%  
  $5.00       33  
  $6.00       34