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15. Concentration of risk (Details Narrative) - USD ($)
9 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Jun. 30, 2020
Jun. 30, 2019
Cash and cash equivalents $ 474,322 $ 877,156 $ 977,635 $ 471,458
Sales Revenue Net [Member]        
Concentration risk percent 78.00% 70.00%    
Accounts Receivable [Member]        
Concentration risk percent 91.00%   95.00%  
Cost of Sales [Member]        
Concentration risk percent 28.00% 44.00%    
Cost of Sales [Member] | One Supplier [Member]        
Concentration risk percent 17.00% 30.00%    
Cost of Sales [Member] | Another Supplier [Member]        
Concentration risk percent 11.00% 14.00%    
Accounts Payable [Member] | One Supplier [Member]        
Concentration risk percent 19.00%      
Accounts Payable [Member] | Another Supplier [Member]        
Concentration risk percent 17.00%   13.00%  
Accounts Payable [Member] | Another Supplier [Member]        
Concentration risk percent     12.00%