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Other capital reserve - 2016 Stock Option and Incentive Plan, RSUs (Details) - 2016 Plan (RSU) - RSUs
12 Months Ended
Mar. 31, 2020
EquityInstruments
shares
Mar. 31, 2019
EquityInstruments
Mar. 31, 2018
EquityInstruments
Share based payments      
Shares approved for issuance | shares 603,792    
RSU's outstanding 271,780 280,886 547,390
Vesting period 16 months    
Vesting Schedule 1      
Share based payments      
Granted during the year 87,879    
Vesting Schedule 1, First Vesting      
Share based payments      
Percentage of shares to vest 12.50%    
Vesting Schedule 1, Second Vesting      
Share based payments      
Quarterly vesting, percentage of shares 12.50%    
Vesting Schedule 2, Fully Vested      
Share based payments      
Granted during the year 4,300    
Vesting Schedule 3      
Share based payments      
Granted during the year 7,277    
Vesting period 4 years    
Vesting Schedule 3, First Vesting      
Share based payments      
Percentage of shares to vest 6.25%    
Vesting Schedule 4      
Share based payments      
Granted during the year 20,000    
Vesting Schedule 4, First Vesting      
Share based payments      
Percentage of shares to vest 10.00%    
Vesting Schedule 4, Second Vesting      
Share based payments      
Quarterly vesting, percentage of shares 8.333%    
Vesting Schedule 5      
Share based payments      
Granted during the year 479,336    
Vesting period 1 year    
Vesting Schedule 5, First Vesting      
Share based payments      
Quarterly vesting, percentage of shares 25.00%    
Vesting Schedule 6      
Share based payments      
Granted during the year 5,000