Product Warranties (Tables)

12 Months Ended

Apr. 30, 2022

Product Warranties Disclosures [Abstract]

Schedule of Product Warranty Liability [Table Text Block]

As of April 30, 2022 and 2021, respectively, changes in the carrying amount of accrued product warranty costs, reported in accrued expenses on the consolidated balance sheets, were as follows (in thousands):

	2022			2021
Balance at beginning of year	$	439		$	527
Warranty costs incurred		(587	)		(619	)
Product warranty accrual		667			531
Balance at end of year	$	519		$	439