Note 5 - Accounts Receivable Agreements (Details Textual) - USD ($)	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Restricted Cash, Total	$ 351,909
Certain Receivables to Unrelated Third-parties [Member]
Accounts Receivable Agreement, Percent of Sold Receivables Advanced	90.00%
Accounts Receivable Agreement, Reserve of Sold Receivables	10.00%
Restricted Cash, Total	$ 400,000
Accounts Receivable, after Allowance for Credit Loss, Total	3,200,000
Sale of Receivables, Maximum Limit of Receivables Uncollected	3,500,000
Proceeds from Collection of Finance Receivables	19,600,000
Certain Receivables to Unrelated Third-parties [Member] | Other Nonoperating Income (Expense) [Member]
Cost of Selling Receivables	$ 300,000
Certain Receivables to Unrelated Third-parties [Member] | Minimum [Member]
Receivables, Cost of Sales, Percent	1.00%
Certain Receivables to Unrelated Third-parties [Member] | Maximum [Member]
Receivables, Cost of Sales, Percent	1.80%