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Note 6 - Inventories - Summary of Inventories (Details) - USD ($)
Sep. 30, 2018
Mar. 31, 2018
Raw materials $ 1,103,638 $ 1,084,030
Work in process 1,871,388 1,828,492
Finished goods 600,937 737,917
Total inventories $ 3,575,963 $ 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.