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INCOME TAXES (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
May 31, 2022 | May 31, 2021 | May 31, 2022 | May 31, 2021 | Aug. 31, 2022 | Aug. 31, 2021
Income Taxes [Abstract] |  |  |  |  |  |
Effective income tax rate | 22.70% | 20.20% | 23.20% | 24.40% |  |
Income Tax Expense (Benefit) [Abstract] |  |  |  |  |  |
Current | $ 227 | $ (394) | $ 1,411 | $ 5,283 |  |
Deferred | 19 | 552 | (187) | 623 |  |
Total | 246 | $ 158 | 1,224 | $ 5,906 |  |
Income Taxes Paid [Abstract] |  |  |  |  |  |
Income taxes paid |  |  | 5,260 |  |  |
Deferred Tax Assets (Liabilities) [Abstract] |  |  |  |  |  |
Depreciation and depletion | (2,213) |  | (2,213) |  |  | $ (2,360)
Non-qualified stock options | 540 |  | 540 |  |  | 547
Accrued compensation | 121 |  | 121 |  |  | 141
Deferred revenues | 96 |  | 96 |  |  | 41
Other | 28 |  | 28 |  |  | 16
Net deferred tax liability | $ (1,428) |  | (1,428) |  |  | $ (1,615)
Forecast [Member] |  |  |  |  |  |
Income Taxes [Abstract] |  |  |  |  |  |
Effective income tax rate |  |  |  |  | 25.00% |
Federal [Member] |  |  |  |  |  |
Income Taxes Paid [Abstract] |  |  |  |  |  |
Income taxes paid |  |  | 4,360 |  |  |
State [Member] |  |  |  |  |  |
Income Taxes Paid [Abstract] |  |  |  |  |  |
Income taxes paid |  |  | $ 900 |  |  |

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