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Income Taxes (Tax Effects of Temporary Differences) (Details) - USD ($)
Jul. 31, 2021
Jul. 31, 2020
Deferred tax assets:    
Inventory and warranty reserves $ 6,774,000 $ 5,786,000
Compensation and commissions 4,338,000 3,210,000
Federal, state and foreign research and experimentation credits 19,324,000 19,656,000
Stock-based compensation 4,979,000 4,955,000
Foreign scientific research and experimental development expenditures 1,496,000 1,765,000
Federal, state and foreign net operating losses 5,413,000 3,942,000
Federal and state capital losses 15,582,000 28,000
Lease liabilities 10,980,000 7,335,000
Other 4,550,000 6,572,000
Less: valuation allowance (28,384,000) (11,471,000)
Total deferred tax assets 45,052,000 41,778,000
 Deferred tax liabilities:    
Plant and equipment (1,146,000) (801,000)
Lease right-of-use assets (10,085,000) (7,080,000)
Intangibles (54,635,000) (50,368,000)
Total deferred tax liabilities (65,866,000) (58,249,000)
Net deferred tax liabilities $ (20,814,000) $ (16,471,000)