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Note 7 - Loan and Line of Credit (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
May 12, 2020
Apr. 14, 2020
Jan. 31, 2018
Sep. 30, 2020
Sep. 30, 2020
Sep. 30, 2019
Proceeds from Issuance of Unsecured Debt         $ 753,300
Repayments of Unsecured Debt         $ 753,300
Paycheck Protection Program CARES Act [Member]            
Proceeds from Issuance of Unsecured Debt   $ 753,300        
Repayments of Unsecured Debt $ 753,300          
PNC Bank [Member]            
Line of Credit Facility, Maximum Borrowing Capacity     $ 550,000      
Debt Instrument, Interest Rate, Effective Percentage       2.67% 2.67%  
Interest Expense, Debt, Total       $ 1,514 $ 2,661  
Long-term Line of Credit, Total       $ 260,000 $ 260,000  
PNC Bank [Member] | London Interbank Offered Rate (LIBOR) [Member]            
Debt Instrument, Basis Spread on Variable Rate     2.50%