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Note 5 - Stock-Based Compensation (Tables)
6 Months Ended
Sep. 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

September 30,

   

Six Months Ended

September 30,

 
   

2014

   

2013

   

2014

   

2013

 

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

  $ 237     $ 208     $ 516     $ 357  

Amount of income tax benefit recognized in earnings

    84       71       182       130  

Amount charged against net income

  $ 153     $ 137       334       227  

Impact on net income per common share:

                               

Basic

  $ 0.04     $ 0.04     $ 0.10     $ 0.07  

Diluted

    0.04       0.04     $ 0.09       0.06  
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

    145,400       89.11       7.5          

Stock options forfeited

    (25,916 )     64.09                  

Stock options expired

    --       --                  

Stock options exercised

    (36,198 )     29.25                  

Outstanding at September 30, 2014

    481,458       53.23       5.0       6,595  
                                 

Exercisable at September 30, 2014

    200,640       31.41       3.3       5,291  
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

    145,400       24.23  

Stock options forfeited

    (25,916 )     17.15  

Stock options vested

    (96,013 )     10.04  

Unvested at September 30, 2014

    280,818       18.32