| Note 5 - Inventories - Inventories (Details) - USD ($) | Sep. 30, 2022 | Sep. 30, 2021 | 
|---|---|---|
| Finished Goods | $ 9,063 | $ 249,571 | 
| Goods-in-process | 1,405,785 | 844,194 | 
| Total | $ 1,414,848 | $ 1,093,765 | 
| X | ||||||||||
| 
- Definition Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef 
 | 
| X | ||||||||||
| 
- Definition Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
 | 
| X | ||||||||||
| 
- Definition Amount before valuation and LIFO reserves of merchandise or goods in the production process expected to be completed within one year or operating cycle, if longer. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef 
 |