Note 3 - Inventories - Summary of Inventory (Details) - USD ($)	Mar. 31, 2023	Mar. 31, 2022
Inventory, Raw Materials, Gross	$ 592,109	$ 421,579
Raw materials	592,109	421,579
Inventory, Finished Goods, Gross	79,807	50,227
Finished goods	79,807	50,227
Inventory, Gross	671,916	471,806
Inventory, Gross	671,916	471,806
Current [Member]
Inventory, Raw Materials, Gross	390,792	240,163
Raw materials	390,792	240,163
Inventory, Finished Goods, Gross	52,673	47,913
Finished goods	52,673	47,913
Inventory, Gross	443,465	288,076
Inventory, Gross	443,465	288,076
Long Term [Member
Inventory, Raw Materials, Gross	201,317	181,406
Raw materials	201,317	181,406
Inventory, Finished Goods, Gross	27,134	2,314
Finished goods	27,134	2,314
Inventory, Gross	228,451	183,730
Inventory, Gross	$ 228,451	$ 183,730