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STOCK-BASED COMPENSATION (Tables)

12 Months Ended

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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Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

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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.

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