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Note 7 - Loan and Line of Credit (Details Textual) - USD ($)
6 Months Ended
May 12, 2020
Apr. 14, 2020
Jan. 31, 2018
Jun. 30, 2020
Jun. 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    
Long-term Line of Credit, Total       $ 260,000  
PNC Bank [Member] | London Interbank Offered Rate (LIBOR) [Member]          
Debt Instrument, Basis Spread on Variable Rate     2.50%