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Stock option and bonus plans (Tables)
12 Months Ended
Mar. 31, 2015
Accounting Policies [Abstract]  
Stock option summary
      Number of options    

Weighted average exercise

price

 
             
 Balance, March 31, 2013    110,000   $5.71 
 Expired    (40,000)  $6.12 
            
 Balance, March 31, 2014    70,000   $5.47 
 Expired    (40,000)  $6.20 
            
 Balance, March 31, 2015    30,000   $4.50 
Information regarding stock options

Weighted average     Number
outstanding at
    Weighted
average
remaining life
    Exercisable
shares at
 
exercise price     March 31, 2015     (years)     March 31, 2015  
                     
  $4.50       30,000       0.8       30,000