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Line of credit (Details) - USD ($)
3 Months Ended 6 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Sep. 30, 2019
Jun. 30, 2019
Jun. 30, 2018
Jun. 29, 2018
Line of Credit Facility [Line Items]                
Line of Credit Facility, Fair Value of Amount Outstanding $ 201,575   $ 201,575          
Line of Credit Facility, Periodic Payment, Interest 4,119 $ 3,035 8,103 $ 10,000        
Line of Credit Facility, Interest Rate at Period End         6.24%      
Repayments of Lines of Credit       201,575        
Accrued expenses $ 638,573   $ 638,573     $ 656,707    
Line of Credit [Member]                
Line of Credit Facility [Line Items]                
Repayments of Lines of Credit       165,000        
Interest paid       2,579        
General and Administrative Expense       1,000        
Line Of Credit Facility, Prime Plus Fee       1,895        
Accrued expenses             $ 28,797  
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