Accrued Expenses - Schedule of Accrued Expenses (Details) - USD ($) $ in Thousands	Apr. 30, 2022	Apr. 30, 2021
Payables And Accruals [Abstract]
Accrued sales allowances	$ 2,392	$ 2,931
Accrued freight	1,253	2,466
Accrued commissions	1,175	1,578
Accrued professional fees	951	701
Accrued warranty	786	717
Accrued taxes other than income	718	1,052
Accrued employee benefits	312	153
Accrued other	266	245
Total accrued expenses	$ 7,853	$ 9,843