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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)