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Description of business and significant accounting policies (Details Narrative) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Apr. 01, 2020
Apr. 02, 2019
Advertising costs $ 103 $ 21 $ 18    
Research and development costs 213 175 152    
Contract liabilities 12 17   $ 57  
Right-of-use assets         $ 407
Lease liabilities         $ 407
Refund liability $ 69 $ 0 $ 0    
Plant and machinery          
Useful Life of Assets 10 years        
Furniture, fixtures and equipment [Member] | Minimum [Member]          
Useful Life of Assets 5 years        
Furniture, fixtures and equipment [Member] | Maximum [Member]          
Useful Life of Assets 10 years        
Motor vehicles          
Useful Life of Assets 5 years