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Note 6 - Inventories - Summary of Inventories (Details) - USD ($)
Jun. 30, 2019
Mar. 31, 2019
Raw materials $ 1,082,203 $ 1,130,917
Work in process 2,250,251 2,325,238
Finished goods 887,329 808,721
Total inventories $ 4,219,783 $ 4,264,876 [1]
[1] The March 31, 2019 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, 2019.