Note 6 - Inventories - Summary of Inventories (Details) - USD ($)
Dec. 31, 2021
Mar. 31, 2021
Raw materials $ 784,004 $ 660,678
Work in process 2,812,910 2,220,723
Finished goods 770,760 1,019,376
Total inventories $ 4,367,675 $ 3,900,777 [1]
[1] The March 31, 2021 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, 2021.