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Note 5 - Debt (Details Textual) - USD ($)
Nov. 05, 2020
Mar. 25, 2019
Sep. 11, 2018
Sep. 30, 2020
Apr. 30, 2020
Apr. 20, 2020
Dec. 31, 2019
Jan. 31, 2019
Line of Credit, Current       $ 500,000     $ 500,000  
Revolving Credit Facility [Member]                
Debt Instrument, Interest Rate, Stated Percentage       3.16%        
Line of Credit Facility, Maximum Borrowing Capacity   $ 750,000 $ 750,000          
Line of Credit, Current       $ 500,000       $ 500,000
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]                
Debt Instrument, Basis Spread on Variable Rate   3.00% 2.25%          
Subsequent Event [Member] | Revolving Credit Facility [Member]                
Repayments of Long-term Lines of Credit $ 500,000              
Term Loan [Member] | Subsequent Event [Member]                
Debt Instrument, Face Amount $ 4,000,000              
Debt Instrument, Term (Year) 5 years              
Debt Instrument, Interest Rate, Stated Percentage 4.25%              
Debt Instrument, Amortization Term (Year) 20 years              
Debt Instrument, Borrower Payment to Debt Guarantors $ 200,000              
Paycheck Protection Program CARES Act [Member]                
Debt Instrument, Face Amount         $ 862,000 $ 862,000