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Income Taxes (Tax Effects of Temporary Differences) (Details) - USD ($)
Jul. 31, 2024
Jul. 31, 2023
Deferred tax assets:    
Inventory and warranty reserves $ 4,685,000 $ 6,147,000
Compensation and commissions 3,401,000 3,221,000
Federal, state and foreign research and experimentation credits 17,559,000 19,308,000
Capitalized U.S. research and experimental expenditures 12,177,000 8,784,000
Stock-based compensation 2,409,000 4,774,000
Foreign scientific research and experimental development expenditures 1,720,000 2,118,000
Federal, state and foreign net operating losses 18,289,000 13,011,000
Federal and state capital losses 14,473,000 15,582,000
Lease liabilities 8,999,000 11,986,000
Deferred revenue, non-current 4,664,000 4,463,000
163(j) Interest Expense Limitation 3,423,000 549,000
Other 1,278,000 1,868,000
Less: valuation allowance (44,888,000) (34,478,000)
Total deferred tax assets 48,189,000 57,333,000
 Deferred tax liabilities:    
Plant and equipment (4,781,000) (4,883,000)
Lease right-of-use assets (7,116,000) (10,510,000)
Intangibles (42,563,000) (50,843,000)
Total deferred tax liabilities (54,460,000) (66,236,000)
Net deferred tax liabilities $ (6,271,000) $ (8,903,000)