Note 6 - Inventories (Tables)

6 Months Ended

Sep. 30, 2017

Notes Tables

Schedule of Inventory, Current [Table Text Block]

	September 30, 2017		March 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