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Line of credit (Details) - USD ($)
12 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2020
Jun. 29, 2018
Line of Credit Facility [Line Items]        
Line of Credit Facility, Fair Value of Amount Outstanding $ 201,575      
Line of Credit Facility, Periodic Payment, Interest $ 10,000 $ 10,000    
Line of Credit Facility, Interest Rate at Period End 5.00%      
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%  
Line of Credit Facility, Collateral Fees, Amount $ 250,000