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Income Taxes (Narrative) (Details) - USD ($) | Jul. 31, 2024 | Jul. 31, 2023
--- | --- | ---
Operating Loss Carryforwards [Line Items] |  |
Net deferred tax liabilities | $ 6,271,000 | $ 8,903,000
Federal, state and foreign research and experimentation credits | 17,559,000 | 19,308,000
Capital loss carryforward | 14,473,000 | 15,582,000
Valuation allowance | 44,888,000 | 34,478,000
Unrecognized tax benefits, including interest | 8,605,000 | 9,166,000
Interest accrued relating to income taxes | 224,000 | 210,000
Unrecognized tax benefits that would positively impact our effective tax rate, if recognized | 7,679,000 | 8,286,000
Reasonably possible decrease in gross unrecognized tax benefits | 512,000 |
Revolving Loan Facility | Credit Facility |  |
Operating Loss Carryforwards [Line Items] |  |
Line of credit facility, current borrowing capacity | 32,500,000 |
Non-current income taxes payable |  |
Operating Loss Carryforwards [Line Items] |  |
Unrecognized tax benefits, including interest | 2,231,000 | 2,208,000
Non-current deferred tax assets |  |
Operating Loss Carryforwards [Line Items] |  |
Unrecognized tax benefits, including interest | 6,374,000 | 6,958,000
Foreign |  |
Operating Loss Carryforwards [Line Items] |  |
Net deferred tax assets | 78,000 | $ 591,000
Federal, state and foreign research and experimentation credits | 335,000 |
Operating loss carryforwards, valuation allowance | 15,666,000 |
Foreign operating loss carryforwards | 14,624,000 |
Federal |  |
Operating Loss Carryforwards [Line Items] |  |
Federal, state and foreign research and experimentation credits | 7,991,000 |
Valuation allowance | 2,799,000 |
State |  |
Operating Loss Carryforwards [Line Items] |  |
Federal, state and foreign research and experimentation credits | 9,234,000 |
State and local operating loss carryforwards | 3,652,000 |
Operating loss carryforwards, valuation allowance | 3,448,000 |
Valuation allowance | 2,799,000 |
State | Research and experimentation credit carryforwards |  |
Operating Loss Carryforwards [Line Items] |  |
Tax credit carryforward, valuation allowance | $ 8,502,000 |

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