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16. MAJOR CUSTOMERS AND VENDORS - Energy segment major customers (Details) | 12 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020
Energy Customer A [Member] |  |
Concentration Risk, Percentage | 48.88% | 58.31%
Energy Customer B [Member] |  |
Concentration Risk, Percentage | 12.36% | 0.00%
Energy Customer C [Member] |  |
Concentration Risk, Percentage | 0.00% | 11.56%

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