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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($) | 12 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |
Aggregate principal amount of fixed-rate debt | $ 43,800,000 | $ 25,600,000
Fair value of aggregate principal amount of debt | 42,800,000 | 24,700,000
Surety deposit balance | 2,100,000 | 2,000,000
Advertising expense | $ 294,000 | $ 279,000
Buildings |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |
Estimated useful lives | 39 years |
Minimum |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |
Billing and payment term | 30 days |
Minimum | Operating equipment and vehicles |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |
Estimated useful lives | 5 years |
Minimum | Office equipment, furniture and fixtures |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |
Estimated useful lives | 5 years |
Maximum |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |
Billing and payment term | 45 days |
Maximum | Operating equipment and vehicles |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |
Estimated useful lives | 7 years |
Maximum | Office equipment, furniture and fixtures |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |
Estimated useful lives | 7 years |

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