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Note 6 - Stock-based Compensation (Tables)
 3 Months Ended
Jun. 30, 2017
Notes Tables  
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]
 
 
Three Months E
nded
June 30
,
 
 
 
2017
 
 
2016
 
Total cost of stock-based compensation charged against
income before income taxes
   $
540
    $
429
 
Amount of income tax benefit (expense) recognized in earnings
   
89
      
(47
 )
Amount charged against net income
  $
629
    $
382
 
Impact on net income per common share:
               
Basic
  $
0.17
     $
0.10
  
Diluted
   
0.16
      
0.10
  
Share-based Compensation, Stock Options, Activity [Table Text Block]
 
 
Number of
Shares
 
 
Weighted-
A
verage Exercise
Price per Share
 
 
Weighted-
A
verage
Remaining
Contractual
Term
 
 
Aggregate
Intrinsic
Value
(000s)
 
Outstanding at March 31, 2017
    
510,361
     $
75.78
      
5.0
     $
23,956
  
Stock options granted
   
93,435
      
122.77
      
5.8
      
 
  
Stock options forfeited
   
(5,866
 )    
96.96
      
5.4
      
 
  
Stock options expired
   
--
      
--
      
--
      
 
  
Stock options exercised
   
(27,135
 )    
54.41
      
--
      
 
  
Outstanding at June 30, 2017
    
570,795
      
84.27
      
5.0
     $
33,701
  
                                 
Exercisable at June 30, 2017
    
185,614
      
61.10
      
4.2
     $
15,260
  
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]
 
 
Number of
Shares
 
 
Weighted-
A
verage
Grant-Date
Fair Value
 
Unvested at March 31, 2017
    
373,766
     $
22.49
  
Stock options granted
   
93,435
      
38.83
  
Stock options forfeited
   
(5,866
 )    
27.95
  
Stock options vested
   
(76,154
 )    
20.92
  
Unvested at June 30, 2017
    
385,181
      
28.14