Note A - Summary of Significant Accounting Policies - Allowance for Doubtful Accounts (Details) - USD ($) |
12 Months Ended | ||
|---|---|---|---|
Sep. 30, 2019 |
Sep. 30, 2018 |
Sep. 30, 2017 |
|
| Balance at Beginning of Year | $ 79,085 | $ 79,085 | $ 93,473 |
| Additions Charged to Costs and Expenses | 210,000 | ||
| Less Write-offs | (14,338) | ||
| Balance at End of Year | $ 289,085 | $ 79,085 | $ 79,085 |
| X | ||||||||||
- Definition Amount of allowance for credit loss on accounts receivable. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Amount of increase (decrease) in allowance for credit loss on accounts receivable. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
|
| X | ||||||||||
- Definition Amount of direct write-downs of accounts receivable charged against the allowance. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|