Note 6 - Inventories (Tables)

9 Months Ended

Dec. 31, 2017

Notes Tables

Schedule of Inventory, Current [Table Text Block]

	December 31, 2017		March 31, 2017
Raw materials	$	1,044,845	$	786,775
Work in process		1,710,799		1,968,990
Finished goods		840,682		602,533
Total inventories	$	3,596,326	$	3,358,298