Note 3 - Inventories - Summary of Inventory (Details) - USD ($)	Jun. 30, 2023	Mar. 31, 2023
Inventory, Raw Materials, Gross	$ 593,934	$ 592,109
Inventory, Finished Goods, Gross	104,757	79,807
Raw materials	593,934	592,109
Inventory, Gross	698,691	671,916
Finished goods	104,757	79,807
Totals	698,691	671,916
Current [Member]
Inventory, Raw Materials, Gross	411,068	390,792
Inventory, Finished Goods, Gross	98,760	52,673
Raw materials	411,068	390,792
Inventory, Gross	509,828	443,465
Finished goods	98,760	52,673
Totals	509,828	443,465
Long Term [Member
Inventory, Raw Materials, Gross	182,866	201,317
Inventory, Finished Goods, Gross	5,997	27,134
Raw materials	182,866	201,317
Inventory, Gross	188,863	228,451
Finished goods	5,997	27,134
Totals	$ 188,863	$ 228,451