| Note 7 - Inventory - Net Inventory (Details) - USD ($) | Dec. 31, 2020 | Dec. 31, 2019 | 
|---|---|---|
| Materials | $ 77,750 | |
| Finished goods | 92,048 | |
| Inventory, Net, Total | $ 169,798 | 
| 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://fasb.org/us-gaap/role/ref/legacyRef 
 | 
| 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://fasb.org/us-gaap/role/ref/legacyRef 
 | 
| X | ||||||||||
| 
- Definition Amount before valuation and LIFO reserves of raw materials expected to be sold, or consumed within one year or operating cycle, if longer. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
 |