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13. MAJOR CUSTOMERS AND VENDORS - Energy segment major suppliers (Details) - Customer Concentration Risk [Member] - Accounts Receivable [Member]
3 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Energy Vendor A [Member]    
Concentration Risk, Percentage 57.82% 10.70%
Energy Vendor B [Member]    
Concentration Risk, Percentage 16.30% 0.00%