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STOCK-BASED COMPENSATION (Tables) | 12 Months Ended
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Sep. 30, 2024
STOCK-BASED COMPENSATION |
Schedule of share-based compensation stock options activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Tranche |  | Tranche |  | Tranche |  | Tranche |  | Tranche |  | Tranche |  | Tranche |  | Tranche |  | Tranche |  | Tranche |  | Tranche
​ | ​ | 15 | ​ | 16 | ​ | 17 | ​ | 18 | ​ | 19 | ​ | 20 | ​ | 21 | ​ | 22 | ​ | 23 | ​ | 24 | ​ | 25
​ | ​ | January 3, | ​ | October 2, | ​ | December 22, | ​ | January 2, | ​ | March 1, | ​ | January 2, | ​ | January 2, | ​ | April 14, | ​ | January 3, | ​ | May 22, | ​ | March 1,
Grant date | ​ | 2017 | ​ | 2017 | ​ | 2017 | ​ | 2018 | ​ | 2018 | ​ | 2019 | ​ | 2020 | ​ | 2021 | ​ | 2022 | ​ | 2023 | ​ | 2024
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Outstanding as of September 30, 2021 |  | 18,000 |  | — |  | 1,800 |  | 19,000 |  | 20,000 |  | 36,000 |  | 38,000 |  | 139,070 |  | — | ​ | — | ​ | —
Number of options granted | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | 40,000 | ​ | — | ​ | —
Options exercised | ​ | — | ​ | — | ​ | (1,000) | ​ | — | ​ | — | ​ | — | ​ | — | ​ | (15,510) | ​ | — | ​ | — | ​ | —
Options cancelled/expired | ​ | (4,000) | ​ | — | ​ | (800) | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | —
Outstanding as of September 30, 2022 | ​ | 14,000 | ​ | — | ​ | — | ​ | 19,000 | ​ | 20,000 | ​ | 36,000 | ​ | 38,000 | ​ | 123,560 | ​ | 40,000 | ​ | — | ​ | —
Number of options granted |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — | ​ | 36,000 | ​ | —
Options exercised |  | — |  | — |  | — |  | — |  | (10,503) |  | — |  | — |  | — |  | — | ​ | — | ​ | —
Options cancelled/expired | ​ | (14,000) | ​ | — | ​ | — | ​ | (19,000) | ​ | (5,497) | ​ | — | ​ | — | ​ | (14,860) | ​ | (2,000) | ​ | — | ​ | —
Outstanding as of September 30, 2023 |  | — |  | — |  | — |  | — |  | 4,000 |  | 36,000 |  | 38,000 |  | 108,700 |  | 38,000 | ​ | 36,000 | ​ | —
Number of options granted | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | 20,000
Options exercised | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | —
Options cancelled/expired | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | (36,000) | ​ | — | ​ | (1,700) | ​ | — | ​ | — | ​ | —
Outstanding as of September 30, 2024 | ​ | — | ​ | — | ​ | — | ​ | — | ​ | 4,000 | ​ | — | ​ | 38,000 | ​ | 107,000 | ​ | 38,000 | ​ | 36,000 | ​ | 20,000
Options vested and exercisable | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | —
At September 30, 2022 | ​ | 14,000 | ​ | — | ​ | — | ​ | 19,000 | ​ | 20,000 | ​ | 36,000 | ​ | 38,000 | ​ | 123,560 | ​ | 40,000 | ​ | — | ​ | —
At September 30, 2023 | ​ | — | ​ | — | ​ | — | ​ | — | ​ | 4,000 | ​ | 36,000 | ​ | 38,000 | ​ | 108,700 | ​ | 38,000 | ​ | 36,000 | ​ | —
At September 30, 2024 | ​ | — | ​ | — | ​ | — | ​ | — | ​ | 4,000 | ​ | — | ​ | 38,000 | ​ | 107,000 | ​ | 38,000 | ​ | 36,000 | ​ | 20,000
Weighted average fair value at the grant date (US$) |  | 4.0 |  | 7.7 |  | 4.4 |  | 5.1 |  | 5.1 |  | 4.0 |  | 2.5 |  | 12.5 |  | 5.4 |  | 4.6 | ​ | 2.1
Schedule of share-based payment award stock options valuation assumptions | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Tranche |  | Tranche |  | Tranche |  | Tranche |  | Tranche |  | Tranche |  | Tranche |  | Tranche |  | Tranche |  | Tranche |  | Tranche | ​
​ | ​ | 15 | ​ | 16 | ​ | 17 | ​ | 18 | ​ | 19 | ​ | 20 | ​ | 21 | ​ | 22 | ​ | 23 | ​ | 24 | ​ | 25 | ​
Exercise price (US$) | ​ | 20.7 | ​ | 16.5 | ​ | 8 | ​ | 9.1 | ​ | 8.2 | ​ | 5.19 | ​ | 5.3 | ​ | 15.85 | ​ | 7.23 | ​ | 6.79 | ​ | 2.15 | ​
Average risk-free interest rate | ​ | 1.94 | % | 1.94 | % | 2.26 | % | 2.25 | % | 2.58 | % | 2.49 | % | 1.67 | % | 0.87 | % | 1.37 | % | 3.77 | % | 4.17 | %
Expected option life (year) | ​ | 5 | ​ | 5 | ​ | 5 | ​ | 5 | ​ | 5 | ​ | 5 | ​ | 5 | ​ | 5 | ​ | 5 | ​ | 10 | ​ | 5 | ​
Volatility rate | ​ | 63.87 | % | 52.40 | % | 63.20 | % | 64.60 | % | 68.20 | % | 103 | % | 52.60 | % | 109.90 | % | 100.95 | % | 73.64 | % | 96.80 | %
Dividend yield | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Subparagraph (f)(2) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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