SCHEDULE II-VALUATION AND QUALIFYING ACCOUNTS

12 Months Ended

Apr. 30, 2020

SCHEDULE II-VALUATION AND QUALIFYING ACCOUNTS

Schedule of Valuation and Qualifying Accounts Disclosure [Text Block]

SUPPLEMENTARY DATA

SCHEDULE II—VALUATION AND QUALIFYING ACCOUNTS

			Additions
	Balance at		Charged to		Charged to				Balance at
	Beginning		Costs and		Other				End of
Description	of Period		Expenses		Accounts		Deductions		Period
	(In thousands)
Allowance for doubtful accounts for the year ended April 30:
2018	$	104	$	976	$	—	$	—	$	1,080
2019	$	1,080	$	198	$	—	$	(237)	$	1,041
2020	$	1,041	$	219	$	—	$	(70)	$	1,190
Warranty reserve for the year ended April 30:
2018	$	1,947	$	1,884	$	—	$	(1,741)	$	2,090
2019	$	2,090	$	702	$	—	$	(1,088)	$	1,704
2020	$	1,704	$	2,069	$	—	$	(1,758)	$	2,015
Reserve for inventory excess and obsolescence for the year ended April 30:
2018	$	2,756	$	2,758	$	—	$	(1,561)	$	3,953
2019	$	3,953	$	5,054	$	—	$	(1,183)	$	7,824
2020	$	7,824	$	5,377	$	—	$	(2,969)	$	10,232
Reserve for self-insured medical claims for the year ended April 30:
2018	$	1,133	$	9,100	$	—	$	(9,230)	$	1,003
2019	$	1,003	$	10,808	$	—	$	(10,867)	$	944
2020	$	944	$	13,031	$	—	$	(13,222)	$	753