Note 6 - Inventories - Summary of Inventories (Details) - USD ($)	Sep. 30, 2017	Mar. 31, 2017
Raw materials	$ 790,901	$ 786,775
Work in process	2,007,545	1,968,990
Finished goods	706,032	602,533
Total inventories	$ 3,504,478	$ 3,358,298	[1]

[1] The March 31, 2017 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, 2017.