13. MAJOR CUSTOMERS AND VENDORS - Digital currency mining segment major customers (Details) - Customer Concentration Risk [Member] - Accounts Receivable [Member]	3 Months Ended	6 Months Ended
Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Mining Pool Operator A [Member]
Concentration Risk, Percentage	99.99%	0.00%	99.95%	0.00%
Mining Pool Operator B [Member]
Concentration Risk, Percentage	0.01%	100.00%	0.05%	100.00%

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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