Income Taxes - Summary of Deferred Tax Assets (Liabilities) Related to Temporary Differences (Details) - USD ($)	Apr. 30, 2022	Apr. 30, 2021
Non-current tax assets (liabilities):
Less valuation allowance	$ (14,400,000)	$ (241,000)
Non Current
Non-current tax assets (liabilities):
Inventories	1,594,000	1,241,000
Accrued expenses, including compensation	1,805,000	2,827,000
Product liability	29,000	6,000
Workers' compensation	7,000	8,000
Warranty reserve	147,000	165,000
Stock-based compensation	801,000	592,000
State bonus depreciation	98,000	51,000
Property taxes		9,000
Property, plant, and equipment	(1,949,000)	(1,696,000)
Intangible assets	11,817,000	3,500,000
Right-of Use assets	(5,570,000)	(5,879,000)
Right-of Use lease liabilities	5,803,000	6,152,000
Other	(141,000)	(52,000)
Less valuation allowance	$ (14,441,000)	(241,000)
Net deferred tax asset - total		$ 6,683,000