Note 6 - Inventory (Details Textual) - USD ($)
Mar. 31, 2021
Dec. 31, 2020
|Inventory, Finished Goods, Gross, Total||$ 88,492||$ 92,048|
|Clinical Trials [Member]|
|Inventory, Finished Goods, Gross, Total||$ 4,000|
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