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Line of credit (Details) - USD ($)
3 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Jun. 30, 2021
Mar. 31, 2021
Jun. 29, 2018
Line of Credit Facility [Line Items]          
Line of Credit Facility, Periodic Payment, Interest $ 3,000 $ 3,000      
Line of Credit Facility, Interest Rate at Period End       0.99%  
Accrued expenses 793,142   $ 695,553    
Interest Expense 4,697 $ 5,518      
Line of credit $ 201,575   $ 201,575    
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%