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Note 3 - Accounts Receivable Agreements (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Sep. 30, 2019
Restricted Cash, Total $ 105,117   $ 105,117   $ 351,909
Certain Receivables to Unrelated Third-parties [Member]          
Accounts Receivable Agreement, Percent of Sold Receivables Advanced 90.00%   90.00%    
Accounts Receivable Agreement, Reserve of Sold Receivables 10.00%   10.00%    
Restricted Cash, Total $ 100,000   $ 100,000    
Accounts Receivable, after Allowance for Credit Loss, Total 500,000   500,000    
Sale of Receivables, Maximum Limit of Receivables Uncollected 4,000,000   4,000,000    
Proceeds from Collection of Finance Receivables     15,900,000 $ 9,900,000  
Certain Receivables to Unrelated Third-parties [Member] | Other Nonoperating Income (Expense) [Member]          
Cost of Selling Receivables $ 100,000 $ 100,000 $ 300,000 $ 200,000  
Certain Receivables to Unrelated Third-parties [Member] | Minimum [Member]          
Receivables, Cost of Sales, Percent     1.00% 2019.00%  
Certain Receivables to Unrelated Third-parties [Member] | Maximum [Member]          
Receivables, Cost of Sales, Percent     1.80%