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STOCK-BASED COMPENSATION (Tables) | 12 Months Ended
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Sep. 30, 2021
STOCK-BASED COMPENSATION |
Schedule of Share-based Compensation, Stock Options, Activity | A summary of the stock option activity under the 2005, 2009 and 2014 Plans is as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Tranche |  | Tranche |  | Tranche |  | Tranche |  | Tranche |  | Tranche |  | Tranche |  | Tranche |  | Tranche |  | Tranche |  | Tranche |  | Tranche |  | Tranche | ​ | Tranche
​ | ​ | 9 | ​ | 10 | ​ | 11 | ​ | 12 | ​ | 13 | ​ | 14 | ​ | 15 | ​ | 16 | ​ | 17 | ​ | 18 | ​ | 19 | ​ | 20 |  | 21 | ​ | 22
​ | ​ | January 2, | ​ | January 2, | ​ | January 4, | ​ | April 19, | ​ | May 16, | ​ | August 3, | ​ | January 3, | ​ | October 2, | ​ | December 22, | ​ | January 2, | ​ | March 1, | ​ | January 2, | ​ | January 2, | ​ | April 14,
Grant date | ​ | 2014 | ​ | 2015 | ​ | 2016 | ​ | 2016 | ​ | 2016 | ​ | 2016 | ​ | 2017 | ​ | 2017 | ​ | 2017 | ​ | 2018 | ​ | 2018 | ​ | 2019 |  | 2020 | ​ | 2021
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | ​ | ​ | ​
Outstanding as of September 30, 2019 |  | 34,500 |  | 19,500 |  | 13,500 |  | 60,000 |  | 20,000 |  | 20,000 |  | 18,000 |  | 2,500 |  | 8,800 | ​ | 29,000 | ​ | 20,000 | ​ | 36,000 | ​ | 38,000 | ​ | —
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | -
Number of options granted | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | —
Options exercised | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | —
Options cancelled/expired | ​ | (34,500) | ​ | (19,500) | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | —
Outstanding as of September 30, 2020 | ​ | — | ​ | — | ​ | 13,500 | ​ | 60,000 | ​ | 20,000 | ​ | 20,000 | ​ | 18,000 | ​ | 2,500 | ​ | 8,800 | ​ | 29,000 | ​ | 20,000 | ​ | 36,000 | ​ | 38,000 | ​ | —
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Number of options granted |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | 160,000
Options exercised |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | (1,000) | ​ | — | ​ | — | ​ | — | ​ | — | ​ | (20,930)
Options cancelled/expired | ​ | — | ​ | — | ​ | — | ​ | (60,000) | ​ | (20,000) | ​ | (20,000) | ​ | — | ​ | (2,500) | ​ | (6,000) | ​ | (10,000) | ​ | — | ​ | — | ​ | — | ​ | —
Outstanding as of September 30, 2021 |  | — |  | — |  | 13,500 |  | — |  | — |  | — |  | 18,000 |  | — |  | 1,800 | ​ | 19,000 | ​ | — | ​ | — | ​ | — | ​ | 139,070
Options vested and exercisable | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
At September 30, 2020 | ​ | — | ​ | — | ​ | 13,500 | ​ | 60,000 | ​ | 20,000 | ​ | 20,000 | ​ | 18,000 | ​ | 2,500 | ​ | 8,800 | ​ | 29,000 | ​ | 20,000 | ​ | 36,000 | ​ | 38,000 | ​ | —
At September 30, 2021 | ​ | — | ​ | — | ​ | 13,500 | ​ | — | ​ | — | ​ | — | ​ | 18,000 | ​ | — | ​ | 1,800 | ​ | 19,000 | ​ | — | ​ | — | ​ | — | ​ | 139,070
Weighted average fair value at the grant date (US$) |  | 6.5 |  | 7.5 |  | 9.0 |  | 15.4 |  | 12.4 |  | 14.4 |  | 4.0 |  | 7.7 |  | 4.4 | ​ | 5.1 | ​ | 5.1 | ​ | 4.0 | ​ | 2.5 | ​ | 12.5
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions | The fair value of each option granted is estimated on the date of grant using the Black-Scholes Option Pricing Model: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Tranche |  |  | Tranche |  | Tranche |  | Tranche |  | Tranche |  | Tranche |  | Tranche |  | Tranche |  | Tranche |  | Tranche |  | Tranche |  | Tranche |  | Tranche |  | Tranche | ​
​ | ​ | 9 | ​ | ​ | 10 | ​ | 11 | ​ | 12 | ​ | 13 | ​ | 14 | ​ | 15 | ​ | 16 | ​ | 17 | ​ | 18 | ​ | 19 |  | 20 |  | 21 |  | 22 | ​
Exercise price (US$) | ​ | 12.7 | ​ | ​ | 14.8 | ​ | 13.8 | ​ | 20.5 | ​ | 16.5 | ​ | 20 | ​ | 20.7 | ​ | 16.5 | ​ | 8 | ​ | 9.1 | ​ | 8.2 |  | 5.19 | ​ | 5.3 |  | 15.85 | ​
Average risk-free interest rate | ​ | 0.76 | % | ​ | 1.07 | % | 1.73 | % | 1.79 | % | 1.75 | % | 1.55 | % | 1.94 | % | 1.94 | % | 2.26 | % | 2.25 | % | 2.58 | % | 2.49 | % | 1.67 | % | 0.87 | %
Expected option life (year) | ​ | 3 | ​ | ​ | 3 | ​ | 5 | ​ | 10 | ​ | 10 | ​ | 10 | ​ | 5 | ​ | 5 | ​ | 5 | ​ | 5 | ​ | 5 |  | 5 |  | 5 |  | 5 | ​
Volatility rate | ​ | 79.2 | % | ​ | 79.67 | % | 80.72 | % | 69.27 | % | 69.92 | % | 65.37 | % | 63.87 | % | 52.40 | % | 63.20 | % | 64.60 | % | 68.20 | % | 103 | % | 52.60 | % | 109.90 | %
Dividend yield | ​ | — | ​ | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — | ​ | — |  | — |  | — |  | — | ​

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