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Line of credit (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2021
Dec. 31, 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 $ 5,000 $ 6,000      
Line of Credit Facility, Interest Rate at Period End           0.99%  
Accrued expenses 779,160   779,160   $ 695,553    
Interest Expense 4,186 $ 5,469 8,883 $ 10,987      
Line of credit $ 201,575   $ 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%