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Note 5 - Stock-Based Compensation (Tables)
3 Months Ended
Jun. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]
   

Three Months Ended

June 30,

 
   

2014

   

2013

 

Total cost of stock-based compensation charged against income before income taxes

  $ 279     $ 149  

Amount of income tax benefit recognized in earnings

    98       57  

Amount charged against net income

  $ 181     $ 92  

Impact on net income per common share:

               

Basic

  $ 0.05     $ 0.03  

Diluted

    0.05       0.03  
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
   

Number of
Shares

   

Weighted- Average Exercise Price per Share

   

Weighted- Average Remaining Contractual Term

   

Aggregate Intrinsic Value (000s)

 

Outstanding at March 31, 2014

    398,172     $ 38.75       4.4     $ 20,505  

Stock options granted

    141,900       89.59       7.8          

Stock options forfeited

    (7,279 )     58.08                  

Stock options expired

    --       --                  

Stock options exercised

    (15,803 )     35.55                  

Outstanding at June 30, 2014

    516,990       52.39       5.2       17,046  
                                 

Exercisable at June 30, 2014

    221,035       30.76       3.5       11,759  
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block]
   

Number of
Shares

   

Weighted-Average
Grant-Date
Fair Value

 

Unvested at March 31, 2014

    257,347     $ 11.86  

Stock options granted

    141,900       24.81  

Stock options forfeited

    (7,279 )     15.72  

Stock options vested

    (96,013 )     10.04  

Unvested at June 30, 2014

    295,955       18.52