Note 6 - Inventories - Summary of Inventories (Details) - USD ($)
Sep. 30, 2020
Mar. 31, 2020
Raw materials $ 953,050 $ 1,017,451
Work in process 1,949,981 1,863,000
Finished goods 1,025,493 1,003,999
Total inventories $ 3,928,524 $ 3,884,450 [1]
[1] The March 31, 2020 Balance Sheet is derived from the audited financial statements contained in our Annual Report on Form 10-K for the fiscal year ended March 31, 2020.