Note 4 - Inventories

12 Months Ended

Mar. 31, 2019

Notes to Financial Statements

Inventory Disclosure [Text Block]

NOTE

4.

INVENTORIES

     Inventories are shown in the following table:
 

	March 31
	2019		2018
Raw materials	$	1,130,917	$	1,084,030
Work in process		2,325,238		1,828,492
Finished goods		808,721		737,917
Total inventories	$	4,264,876	$	3,650,439