Note 5 - Accounts Receivable and Net Sales (Details Textual) - USD ($) |
Jun. 30, 2018 |
Sep. 30, 2017 |
|---|---|---|
| Allowance for Doubtful Accounts Receivable, Current, Ending Balance | $ 79,085 | $ 79,085 |
| X | ||||||||||
- Definition A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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