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Commitments and contingencies (Details - Lease cost) - USD ($)
3 Months Ended 9 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2022
Mar. 31, 2021
Commitments and Contingencies Disclosure [Abstract]        
Operating lease cost $ 427,692 $ 189,647 $ 838,726 $ 559,606
Cash paid for amounts included in the measurement of lease liabilities $ 234,504 $ 130,893 $ 656,961 $ 473,285
Remaining lease term in years 1.33 – 6.17   1.33 – 6.17  
Lease remaining term   2 years 6 months   2 years 6 months
Average discount rate - operating leases 5% – 8   5% – 8%  
Average discount rate - operating leases   8.00%   8.00%