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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Concentrations and Credit Risk (Details) | 12 Months Ended |
--- | --- | ---
Sep. 30, 2022 USD ($) item customer | Sep. 30, 2021 USD ($) customer item | Sep. 30, 2020 customer item | Sep. 30, 2022 HKD ($) customer item
Concentration Risk [Line Items] |  |  |  |
Transfer between level 1and level 2 | $ 0 |  |  |
Asset, transfer into (out of) of level 3 | 0 |  |  |
Cash and cash equivalents, certificates of deposit and restricted cash were on deposit at financial institutions not subject to insured | 10,277,243 | $ 7,305,799 |  |
Cash and cash equivalents deposited in financial institutions | 1,001,568 | 1,073,196 |  |
Cash and cash equivalents deposited in financial institutions annual limit | 65,000 |  |  | $ 500,000
Cash deposited in FI insured by FDIC | $ 3,700,202 | $ 4,228,173 |  |
Customer | Revenue |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Number of customers | customer | 2 | 3 | 3 | 2
Customer | Accounts Receivable |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Number of customers | customer | 3 | 1 | 3 | 3
Customer | Customer One | Revenue |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk (in percent) | 11.00% | 11.00% | 18.00% |
Customer | Customer One | Accounts Receivable |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk (in percent) | 61.00% | 77.00% | 35.00% |
Customer | Customer Two | Revenue |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk (in percent) | 11.00% | 11.00% | 11.00% |
Customer | Customer Two | Accounts Receivable |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk (in percent) | 13.00% |  | 16.00% |
Customer | Customer Three | Revenue |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk (in percent) |  | 10.00% | 10.00% |
Customer | Customer Three | Accounts Receivable |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk (in percent) | 11.00% |  | 14.00% |
Supplier | Purchases |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Number of vendors | item | 1 | 1 | 2 | 1
Supplier | Supplier One | Purchases |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk (in percent) | 14.00% | 13.00% | 11.00% |
Supplier | Supplier One | Accounts Receivable |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Percentage of accounts payable outstanding from transaction with supplier | 18.00% |  |  |
Supplier | Supplier Two | Purchases |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk (in percent) |  |  | 10.00% |

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