Inventories, Net (Tables)

12 Months Ended

Apr. 30, 2021

Inventory Disclosure [Abstract]

Schedule of Inventory, Current [Table Text Block]

Inventories, net at April 30, 2021 and 2020, respectively, consisted of the following (in thousands):

	April 30, 2021		April 30, 2020
Raw Materials and Component Parts	$	12,386	$	15,470
Work in Progress		6,259		6,104
Finished Goods		1,016		1,384
	$	19,661	$	22,958