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INCOME TAXES (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
May 31, 2021 | Feb. 28, 2021 | May 31, 2020 | Feb. 28, 2021 | May 31, 2021 | May 31, 2020 | Aug. 31, 2020
Income Taxes [Abstract] |  |  |  |  |  |  |
Effective income tax rate | 24.70% |  | 24.80% |  | 24.70% | 24.60% |
Income Tax Expense (Benefit) [Abstract] |  |  |  |  |  |  |
Current | $ (394) |  | $ 21 |  | $ 5,283 | $ 1,265 |
Deferred | 552 |  | (12) |  | 623 | 710 |
Total | 158 | $ 5,489 | 9 | $ 5,749 | 5,906 | 1,975 |
Income Taxes Paid [Abstract] |  |  |  |  |  |  |
Income taxes paid |  |  | 234 |  | 0 | 1,305 |
Deferred Tax Assets (Liabilities) [Abstract] |  |  |  |  |  |  |
Depreciation and depletion | (2,244) |  |  |  | (2,244) |  | $ (1,701)
Non-qualified stock options | 528 |  |  |  | 528 |  | 491
Accrued compensation | 98 |  |  |  | 98 |  | 167
Deferred revenues | 52 |  |  |  | 52 |  | 89
Other | 57 |  |  |  | 57 |  | 45
Net operating loss carryforwards | 0 |  |  |  | 0 |  | 23
Net deferred tax liability | (1,509) |  |  |  | (1,509) |  | $ (886)
Federal [Member] |  |  |  |  |  |  |
Income Taxes Paid [Abstract] |  |  |  |  |  |  |
Income taxes paid | 0 |  | 212 |  | 0 | 1,089 |
State [Member] |  |  |  |  |  |  |
Income Taxes Paid [Abstract] |  |  |  |  |  |  |
Income taxes paid | $ 0 |  | $ 22 |  | $ 0 | $ 216 |

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