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Stock option and bonus plans (Tables)
12 Months Ended
Mar. 31, 2019
Accounting Policies [Abstract]  
Stock option summary
   Number of options  Weighted Average Exercise Price
             
 Balance, March 31, 2017, 2018 and 2019    850,000   $1.50 
Information regarding stock options
 

Weighted average

exercise price

    

Number

outstanding at

March 31, 2019

    

Weighted average

remaining life

(years)

    

Exercisable

shares at

March 31, 2019

 
                  
$1.50    850,000    3.5    850,000 
Schedule of Fair value of Stock Options
    For the Fiscal Year Ended March 31,  
    2017    2018    2019 
                
Risk-free interest rate (1)   N/A    N/A    N/A 
Expected life (years) (2)   N/A    N/A    N/A 
Expected dividend yield (3)   N/A    N/A    N/A 
Volatility (4)   N/A    N/A    N/A 
Fair value of options at grant date per share   N/A    N/A    N/A