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Income Taxes (Tax Effects of Temporary Differences) (Details) - USD ($)
Jul. 31, 2023
Jul. 31, 2022
Deferred tax assets:    
Inventory and warranty reserves $ 6,147,000 $ 5,970,000
Compensation and commissions 3,221,000 4,376,000
Federal, state and foreign research and experimentation credits 19,308,000 19,476,000
Capitalized U.S. research and experimental expenditures 8,784,000 0
Stock-based compensation 4,774,000 3,950,000
Foreign scientific research and experimental development expenditures 2,118,000 1,890,000
Federal, state and foreign net operating losses 13,011,000 14,481,000
Federal and state capital losses 15,582,000 15,582,000
Lease liabilities 11,986,000 12,595,000
Deferred revenue, non-current 4,463,000 2,194,000
Other 2,417,000 3,725,000
Less: valuation allowance (34,478,000) (31,227,000)
Total deferred tax assets 57,333,000 53,012,000
 Deferred tax liabilities:    
Plant and equipment (4,883,000) (3,489,000)
Lease right-of-use assets (10,510,000) (11,801,000)
Intangibles (50,843,000) (52,681,000)
Total deferred tax liabilities (66,236,000) (67,971,000)
Net deferred tax liabilities $ (8,903,000) $ (14,959,000)