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Note 3 - Financed Receivables (Details Textual) - Restated Financing Agreement [Member] - USD ($)
Mar. 11, 2019
Sep. 25, 2021
Mar. 27, 2021
Advance Rate, Percent of Invoices Issued 85.00%    
Line of Credit Facility, Maximum Borrowing Capacity $ 2,500,000    
Debt Instrument, Interest Rate, Stated Percentage 4.50%    
Debt Instrument, Basis Spread on Variable Rate 1.00%    
Debt Instrument, Fee Amount $ 14,700    
Long-term Line of Credit, Total   $ 955,000 $ 683,000