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2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Segment Wise Goodwill Activity (Details) (Details) - USD ($) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Jun. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2019
Goodwill | $ 19,049,198 | $ 5,903,641 | $ 31,797,564 | $ 32,034,559 |
Goodwill, Impairment Loss | 5,723,388 |  |  |  |
Digital [Member] |  |  |  |  |
Goodwill | 12,048,419 |  |  |  |
Goodwill, Acquired During Period | 12,048,419 |  |  |  |
Goodwill, Impairment Loss |  |  |  |  |
Energy [Member] |  |  |  |  |
Goodwill | 7,000,779 | 4,926,253 |  |  | 4,919,858
Goodwill, Acquired During Period | 6,820,526 | 6,395 |  |  |
Goodwill, Impairment Loss | 4,746,000 |  |  |  |
Others [Member] |  |  |  |  |
Goodwill |  | 977,388 |  |  |
Goodwill, Acquired During Period |  | 977,388 |  |  |
Goodwill, Impairment Loss | 977,388 |  |  |  |
Total [Member] |  |  |  |  |
Goodwill | 19,049,198 | 5,903,641 |  |  | $ 4,919,858
Goodwill, Acquired During Period | 18,868,945 | 983,783 |  |  |
Goodwill, Impairment Loss | $ 5,723,388 |  |  |  |

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