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Income Taxes - Deferred Tax Assets (Liabilities) Related to Temporary Differences (Detail) - USD ($) | Apr. 30, 2021 | Apr. 30, 2020
--- | --- | ---
Deferred tax assets (liabilities): |  |
Less valuation allowance | $ (79,000) |
Net deferred tax asset/(liability) — total | (904,000) | $ (457,000)
Non Current |  |
Deferred tax assets (liabilities): |  |
Net operating loss carryforwards and tax credits | 3,189,000 | 3,158,000
Inventories | 4,508,000 | 6,082,000
Accrued expenses, including compensation | 4,952,000 | 4,063,000
Product liability | 263,000 | 434,000
Accrued promotions | 139,000 | 69,000
Workers' compensation | 497,000 | 486,000
Warranty reserve | 1,303,000 | 987,000
Stock-based compensation | 1,517,000 | 2,319,000
State bonus depreciation | 888,000 | 1,287,000
Property taxes | (250,000) | (254,000)
Property, plant, and equipment | (13,994,000) | (15,889,000)
Intangible assets | (914,000) | (633,000)
Right-of-use assets | (1,091,000) | (1,685,000)
Right-of-use liabilities | 1,131,000 | 1,734,000
Pension | 293,000 | 241,000
Other | (38,000) | 331,000
Less valuation allowance | $ (3,297,000) | $ (3,187,000)

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