Note 3 - Inventories - Summary of Inventory (Details) - USD ($)	Dec. 31, 2023	Mar. 31, 2023
Raw materials	$ 562,178	$ 592,109
Raw materials	562,178	592,109
Finished goods	66,949	79,807
Finished goods	66,949	79,807
Totals	629,127	671,916
Totals	629,127	671,916
Current [Member]
Raw materials	426,480	390,792
Raw materials	426,480	390,792
Finished goods	60,951	52,673
Finished goods	60,951	52,673
Totals	487,431	443,465
Totals	487,431	443,465
Long Term [Member
Raw materials	135,698	201,317
Raw materials	135,698	201,317
Finished goods	5,998	27,134
Finished goods	5,998	27,134
Totals	141,696	228,451
Totals	$ 141,696	$ 228,451