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Stock Plans And Stock-Based Compensation: Schedule of Stock Options Outstanding, less estimated forfeitures (Tables)
6 Months Ended
Sep. 30, 2016
Tables/Schedules  
Schedule of Stock Options Outstanding, less estimated forfeitures
  
September 30,
 
  
2016
  
2015
 
Stock options fully vested and expected to vest:
      
Number
  
223,654
   
390,654
 
Weighted average exercise price
 
$
4.73
  
$
8.03
 
Aggregate intrinsic value (1)
 
$
342,000
  
$
251,000
 
Weighted average contractual term of options (years)
  
3.84
   
3.09
 
Stock options fully vested and currently exercisable:
        
Number
  
223,654
   
390,654
 
Weighted average exercise price
 
$
4.73
  
$
8.03
 
Aggregate intrinsic value (1)
 
$
342,000
  
$
251,000
 
Weighted average contractual term of options (years)
  
3.84
   
3.09
 
         
      (1) The aggregate intrinsic value of a stock option in the table above represents the total pre-tax intrinsic value (the amount by which the current market value of the underlying stock exceeds the exercise price) that would have been received by the option holders had all option holders exercised.  This amount changes based on changes in the market value of the Company's stock.