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Note 6 - Inventories - Summary of Inventories (Details) - USD ($)
Jun. 30, 2018
Mar. 31, 2018
Raw materials $ 1,064,517 $ 1,084,030
Work in process 1,889,635 1,828,492
Finished goods 667,529 737,917
Total inventories $ 3,621,681 $ 3,650,439 [1]
[1] The March 31, 2018 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, 2018.