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Note 6 - Accounts Receivable Agreements (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Sep. 30, 2018
Restricted Cash, Total $ 106,447   $ 106,447  
Cost of Goods and Services Sold, Total $ 13,709,089 $ 8,304,463 $ 22,139,813 $ 17,208,073  
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 900,000   900,000    
Proceeds from Collection of Finance Receivables     2,900,000    
Certain Receivables to Unrelated Third-parties [Member] | Other Expense [Member]          
Cost of Goods and Services Sold, Total $ 43,000   $ 43,000    
Certain Receivables to Unrelated Third-parties [Member] | Minimum [Member]          
Receivables, Cost of Sales, Percent     1.75%    
Certain Receivables to Unrelated Third-parties [Member] | Maximum [Member]          
Receivables, Cost of Sales, Percent     2.00%