Note 6 - Inventories - Summary of Inventories (Details) - USD ($)	Dec. 31, 2016	Mar. 31, 2016
Raw materials	$ 763,869	$ 810,987
Work in process	1,779,504	1,653,800
Finished goods	619,105	740,446
Total inventories	$ 3,162,478	$ 3,205,233	[1]

[1] The March 31, 2016 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, 2016.