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STOCK-BASED COMPENSATION - Stock option activity (Details) - ¥ / shares |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
May 22, 2023 | Jan. 03, 2022 | Apr. 14, 2021 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
STOCK-BASED COMPENSATION |  |  |  |  |  |
Number of options granted | 38,000 | 40,000 |  |  |  |
Tranche 11 |  |  |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |  |  |
Grant date |  |  |  | Jan. 04, 2016 |  |
Options outstanding |  |  |  | 12,500 | 12,500 | 13,500
Number of options granted |  |  |  | 0 | 0 | 0
Options exercised |  |  |  | 0 | 0 | 0
Options cancelled/expired |  |  |  | (12,500) | 0 | (1,000)
Options outstanding |  |  |  | 0 | 12,500 | 12,500
Options vested and exercisable |  |  |  | 0 | 12,500 | 12,500
Weighted average fair value at the grant date (USD) |  |  |  | ¥ 9.0 |  |
Tranche 12 |  |  |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |  |  |
Grant date |  |  |  | Apr. 19, 2016 |  |
Options outstanding |  |  |  | 0 | 0 | 60,000
Number of options granted |  |  |  | 0 | 0 | 0
Options exercised |  |  |  | 0 | 0 | 0
Options cancelled/expired |  |  |  | 0 | 0 | (60,000)
Options outstanding |  |  |  | 0 | 0 | 0
Options vested and exercisable |  |  |  | 0 | 0 | 0
Weighted average fair value at the grant date (USD) |  |  |  | ¥ 15.4 |  |
Tranche 13 |  |  |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |  |  |
Grant date |  |  |  | May 16, 2016 |  |
Options outstanding |  |  |  | 0 | 0 | 20,000
Number of options granted |  |  |  | 0 | 0 | 0
Options exercised |  |  |  | 0 | 0 | 0
Options cancelled/expired |  |  |  | 0 | 0 | (20,000)
Options outstanding |  |  |  | 0 | 0 | 0
Options vested and exercisable |  |  |  | 0 | 0 | 0
Weighted average fair value at the grant date (USD) |  |  |  | ¥ 12.4 |  |
Tranche 14 |  |  |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |  |  |
Grant date |  |  |  | Aug. 03, 2016 |  |
Options outstanding |  |  |  | 0 | 0 | 20,000
Number of options granted |  |  |  | 0 | 0 | 0
Options exercised |  |  |  | 0 | 0 | 0
Options cancelled/expired |  |  |  | 0 | 0 | (20,000)
Options outstanding |  |  |  | 0 | 0 | 0
Options vested and exercisable |  |  |  | 0 | 0 | 0
Weighted average fair value at the grant date (USD) |  |  |  | ¥ 14.4 |  |
Tranche Fifteen [Member] |  |  |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |  |  |
Grant date |  |  |  | Jan. 03, 2017 |  |
Options outstanding |  |  |  | 14,000 | 18,000 | 18,000
Number of options granted |  |  |  | 0 | 0 | 0
Options exercised |  |  |  | 0 | 0 | 0
Options cancelled/expired |  |  |  | (14,000) | (4,000) | 0
Options outstanding |  |  |  | 0 | 14,000 | 18,000
Options vested and exercisable |  |  |  | 0 | 14,000 | 18,000
Weighted average fair value at the grant date (USD) |  |  |  | ¥ 4.0 |  |
Tranche 16 |  |  |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |  |  |
Grant date |  |  |  | Oct. 02, 2017 |  |
Options outstanding |  |  |  | 0 | 0 | 2,500
Number of options granted |  |  |  | 0 | 0 | 0
Options exercised |  |  |  | 0 | 0 | 0
Options cancelled/expired |  |  |  | 0 | 0 | (2,500)
Options outstanding |  |  |  | 0 | 0 | 0
Options vested and exercisable |  |  |  | 0 | 0 | 0
Weighted average fair value at the grant date (USD) |  |  |  | ¥ 7.7 |  |
Tranche 17 |  |  |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |  |  |
Grant date |  |  |  | Dec. 22, 2017 |  |
Options outstanding |  |  |  | 0 | 1,800 | 8,800
Number of options granted |  |  |  | 0 | 0 | 0
Options exercised |  |  |  | 0 | (1,000) | (1,000)
Options cancelled/expired |  |  |  | 0 | (800) | (6,000)
Options outstanding |  |  |  | 0 | 0 | 1,800
Options vested and exercisable |  |  |  | 0 | 0 | 1,800
Weighted average fair value at the grant date (USD) |  |  |  | ¥ 4.4 |  |
Tranche 18 |  |  |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |  |  |
Grant date |  |  |  | Jan. 02, 2018 |  |
Options outstanding |  |  |  | 19,000 | 19,000 | 29,000
Number of options granted |  |  |  | 0 | 0 | 0
Options exercised |  |  |  | 0 | 0 | 0
Options cancelled/expired |  |  |  | (19,000) | 0 | (10,000)
Options outstanding |  |  |  | 0 | 19,000 | 19,000
Options vested and exercisable |  |  |  | 0 | 19,000 | 19,000
Weighted average fair value at the grant date (USD) |  |  |  | ¥ 5.1 |  |
Tranche 19 |  |  |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |  |  |
Grant date |  |  |  | Mar. 01, 2018 |  |
Options outstanding |  |  |  | 20,000 | 20,000 | 20,000
Number of options granted |  |  |  | 0 | 0 | 0
Options exercised |  |  |  | (5,497) | 0 | 0
Options cancelled/expired |  |  |  | (10,503) | 0 | 0
Options outstanding |  |  |  | 4,000 | 20,000 | 20,000
Options vested and exercisable |  |  |  | 4,000 | 20,000 | 20,000
Weighted average fair value at the grant date (USD) |  |  |  | ¥ 5.1 |  |
Tranche 20 |  |  |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |  |  |
Grant date |  |  |  | Jan. 02, 2019 |  |
Options outstanding |  |  |  | 36,000 | 36,000 | 36,000
Number of options granted |  |  |  | 0 | 0 | 0
Options exercised |  |  |  | 0 | 0 | 0
Options cancelled/expired |  |  |  | 0 | 0 | 0
Options outstanding |  |  |  | 36,000 | 36,000 | 36,000
Options vested and exercisable |  |  |  | 36,000 | 36,000 | 36,000
Weighted average fair value at the grant date (USD) |  |  |  | ¥ 4.0 |  |
Tranche 21 |  |  |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |  |  |
Grant date |  |  |  | Jan. 02, 2020 |  |
Options outstanding |  |  |  | 38,000 | 38,000 | 38,000
Number of options granted |  |  | 160,000 | 0 | 0 | 0
Options exercised |  |  |  | 0 | 0 | 0
Options cancelled/expired |  |  |  | 0 | 0 | 0
Options outstanding |  |  |  | 38,000 | 38,000 | 38,000
Options vested and exercisable |  |  |  | 38,000 | 38,000 | 38,000
Weighted average fair value at the grant date (USD) |  |  |  | ¥ 2.5 |  |
Tranche 22 |  |  |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |  |  |
Grant date |  |  |  | Apr. 14, 2021 |  |
Options outstanding |  |  |  | 123,560 | 139,070 | 0
Number of options granted |  |  |  | 0 | 0 | 160,000
Options exercised |  |  |  | 0 | (15,510) | (20,930)
Options cancelled/expired |  |  |  | (14,860) | 0 | 0
Options outstanding |  |  |  | 108,700 | 123,560 | 139,070
Options vested and exercisable |  |  |  | 108,700 | 123,560 | 139,070
Weighted average fair value at the grant date (USD) |  |  |  | ¥ 12.5 |  |
Tranche 23 |  |  |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |  |  |
Grant date |  |  |  | Jan. 03, 2022 |  |
Options outstanding |  |  |  | 40,000 | 0 | 0
Number of options granted |  |  |  | 0 | 40,000 | 0
Options exercised |  |  |  | 0 | 0 | 0
Options cancelled/expired |  |  |  | (2,000) | 0 | 0
Options outstanding |  |  |  | 38,000 | 40,000 | 0
Options vested and exercisable |  |  |  | 38,000 | 40,000 | 0
Weighted average fair value at the grant date (USD) |  |  |  | ¥ 5.4 |  |
Tranche 24 |  |  |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |  |  |
Options outstanding |  |  |  | 0 | 0 | 0
Number of options granted |  |  |  | 36,000 | 0 | 0
Options exercised |  |  |  | 0 | 0 | 0
Options cancelled/expired |  |  |  | 0 | 0 | 0
Options outstanding |  |  |  | 36,000 | 0 | 0
Options vested and exercisable |  |  |  | 36,000 | 0 | 0
Weighted average fair value at the grant date (USD) |  |  |  | ¥ 4.6 |  |

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