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STOCK-BASED COMPENSATION - Stock option activity (Details) - ¥ / shares
 12 Months Ended
Jan. 03, 2022
Apr. 14, 2021
Jan. 02, 2020
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
STOCK-BASED COMPENSATION            
Number of options granted 40,000          
Tranche 11            
STOCK-BASED COMPENSATION            
Grant date       Jan. 04, 2016    
Options outstanding       13,500 13,500 13,500
Number of options granted       (1,000) 0 0
Options exercised       (1,000) 0 0
Options cancelled/expired       (1,000) 0 0
Options outstanding       12,500 13,500 13,500
Options vested and exercisable       12,500 13,500  
Weighted average fair value at the grant date (USD)       ¥ 9.0    
Tranche 12            
STOCK-BASED COMPENSATION            
Grant date       Apr. 19, 2016    
Options outstanding       0 60,000 60,000
Number of options granted         0 0
Options exercised         0 0
Options cancelled/expired         (60,000) 0
Options outstanding       0 0 60,000
Options vested and exercisable       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 20,000 20,000
Number of options granted         0 0
Options exercised         0 0
Options cancelled/expired         (20,000) 0
Options outstanding       0 0 20,000
Options vested and exercisable       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 20,000 20,000
Number of options granted         0 0
Options exercised         0 0
Options cancelled/expired         (20,000) 0
Options outstanding       0 0 20,000
Options vested and exercisable       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       18,000 18,000 18,000
Number of options granted         0 0
Options exercised       (4,000) 0 0
Options cancelled/expired       (4,000) 0 0
Options outstanding       4,000 18,000 18,000
Options vested and exercisable       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 2,500 2,500
Number of options granted         0 0
Options exercised         0 0
Options cancelled/expired         (2,500) 0
Options outstanding       0 0 2,500
Options vested and exercisable       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       1,800 8,800 8,800
Number of options granted         0 0
Options exercised       (1,000) (1,000) 0
Options cancelled/expired       (800) (6,000) 0
Options outstanding       0 1,800 8,800
Options vested and exercisable       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 29,000 29,000
Number of options granted         0 0
Options exercised         0 0
Options cancelled/expired         (10,000) 0
Options outstanding       19,000 19,000 29,000
Options vested and exercisable       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       0 20,000 20,000
Number of options granted         0 0
Options exercised         0 0
Options cancelled/expired         0 0
Options outstanding       0 0 20,000
Options vested and exercisable       0 0  
Weighted average fair value at the grant date (USD)       ¥ 5.1    
Tranche 20            
STOCK-BASED COMPENSATION            
Grant date       Jan. 02, 2019    
Options outstanding       0 36,000 36,000
Number of options granted         0 0
Options exercised         0 0
Options cancelled/expired         0 0
Options outstanding       0 0 36,000
Options vested and exercisable       0 0  
Weighted average fair value at the grant date (USD)       ¥ 4.0    
Tranche 21            
STOCK-BASED COMPENSATION            
Grant date       Jan. 02, 2020    
Options outstanding       0 38,000 38,000
Number of options granted   160,000 38,000   0 0
Options exercised         0 0
Options cancelled/expired         0 0
Options outstanding       0 0 38,000
Options vested and exercisable       0 0  
Weighted average fair value at the grant date (USD)       ¥ 2.5    
Tranche 22            
STOCK-BASED COMPENSATION            
Grant date       Apr. 14, 201    
Options outstanding       139,070 0 0
Number of options granted         160,000 0
Options exercised       (15,510) (20,930) 0
Options cancelled/expired         0 0
Options outstanding       123,560 139,070 0
Options vested and exercisable       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       0 0 0
Number of options granted       40,000 0 0
Options exercised         0 0
Options cancelled/expired         0 0
Options outstanding       0 0 0
Options vested and exercisable       40,000 0  
Weighted average fair value at the grant date (USD)       ¥ 5.4