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Income taxes (Details) - USD ($)
3 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Current:    
Federal $ 0 $ 234,629
State 9,921 108,346
Foreign 0 0
Total current income tax provision 9,921 342,975
Deferred:    
Federal (169,467) 0
State (103,145) 0
Foreign (185,105) 0
Total deferred taxes (457,717) 0
Total provision for income taxes $ (447,796) $ 342,975