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Significant Components of Deferred Income Taxes (Details) - USD ($) $ in Thousands | Jul. 31, 2022 | Jul. 31, 2021 | Jul. 31, 2020 | Jul. 31, 2019
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Income Tax Disclosure [Abstract] |  |  |  |
Bad debt reserve | $ 959 | $ 1,011 |  |
Accrued expenses | 3,570 | 3,456 |  |
Stock options and restricted stock | 42 | 980 |  |
Charitable contributions | 730 | 778 |  |
Depreciation | (640) | (373) |  |
Unrealized gain | 2,895 | (1,826) |  |
Net operating loss | 40,733 | 49,368 |  |
Deferred revenue |  | (352) |  |
Total deferred income tax assets | 48,289 | 53,042 |  |
Valuation allowance | (11,588) | (11,540) | $ (58,700) | $ (74,170)
NET DEFERRED INCOME TAX ASSETS | $ 36,701 | $ 41,502 |  |

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