Note 4 - Inventories

12 Months Ended

Mar. 31, 2020

Notes to Financial Statements

Inventory Disclosure [Text Block]

NOTE

4.

INVENTORIES

     Inventories are shown in the following table:
 

	March 31
	2020		2019
Raw materials	$	1,017,451	$	1,130,917
Work in process		1,863,000		2,325,238
Finished goods		1,003,999		808,721
Total inventories	$	3,884,450	$	4,264,876