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Line of credit (Details) - USD ($)
3 Months Ended 6 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Sep. 30, 2020
Jun. 30, 2020
Jun. 29, 2018
Line of Credit Facility [Line Items]              
Line of Credit Facility, Periodic Payment, Interest $ 3,000 $ 4,000 $ 6,000 $ 8,000      
Line of Credit Facility, Interest Rate at Period End         6.24%    
Accrued expenses 726,410   726,410     $ 681,047  
Interest Expense $ 5,469 $ 4,119 $ 10,987 $ 8,103      
Notes Payable to Banks [Member]              
Line of Credit Facility [Line Items]              
Notes Payable to Bank             $ 250,000
Debt Instrument, Interest Rate, Stated Percentage             5.00%
Debt Instrument, Basis Spread on Variable Rate     74.00%        
Debt Instrument, Interest Rate During Period     5.74%