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Line of credit (Details) - USD ($)
3 Months Ended
Sep. 30, 2019
Sep. 30, 2018
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        
Line of Credit Facility, Periodic Payment, Interest $ 3,639 $ 6,580      
Line of Credit Facility, Interest Rate at Period End 6.24%        
Repayments of Lines of Credit   201,575      
Accrued expenses $ 619,413   $ 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