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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