Note 6 - Inventories (Tables)

6 Months Ended

Sep. 30, 2020

Notes Tables

Schedule of Inventory, Current [Table Text Block]

	Sept. 30, 2020		March 31, 2020
Raw materials	$	953,050	$	1,017,451
Work in process		1,949,981		1,863,000
Finished goods		1,025,493		1,003,999
Total inventories	$	3,928,524	$	3,884,450