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Note 6 - Loan Payable (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Sep. 25, 2014
Jan. 26, 2009
Construction Loan           $ 7,750,000
PA-1 [Member]            
Debt Instrument, Debt Default, Amount         $ 8,137,117  
Pennvest Loan [Member]            
Construction Loan $ 9,506,298   $ 9,506,298      
Accrued Interest and Late Charges Payable 1,752,298   1,752,298      
Line of Credit Facility, Maximum Borrowing Capacity 7,754,000   $ 7,754,000      
Term Loan, Period for Interest Only Payments (Year)     3 years      
Term Loan, Period for Amortization of Principal (Year)     10 years      
Debt Instrument, Annual Principal Payment 4,273,000   $ 4,273,000      
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 794,000   794,000      
Long-term Debt, Maturities, Repayments of Principal in Year Two 819,000   819,000      
Long-term Debt, Maturities, Repayments of Principal in Year Three 846,000   846,000      
Long-term Debt, Maturities, Repayments of Principal in Year Four 873,000   873,000      
Long-term Debt, Maturities, Repayments of Principal in Year Five 149,000   149,000      
Interest Expense, Debt, Total $ 61,722 $ 59,109 $ 185,166 $ 172,856    
Pennvest Loan [Member] | Years One Through Five [Member]            
Debt Instrument, Interest Rate During Period     2.547%      
Pennvest Loan [Member] | Years Six Through Maturity [Member]            
Debt Instrument, Interest Rate During Period     3.184%