XML 210 R84.htm IDEA: XBRL DOCUMENT v3.25.1
STOCK-BASED COMPENSATION - Stock option activity (Details) - ¥ / shares
 12 Months Ended
Mar. 01, 2024
May 22, 2023
Jan. 03, 2022
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
STOCK-BASED COMPENSATION            
Number of options granted 20,000 38,000 40,000      
Tranche 15            
STOCK-BASED COMPENSATION            
Grant date       Jan. 03, 2017    
Options outstanding       0 14,000 18,000
Number of options granted       0 0 0
Options exercised       0 0 0
Options cancelled/expired       0 (14,000) (4,000)
Options outstanding       0 0 14,000
Options vested and exercisable       0 0 14,000
Weighted average fair value at the grant date (USD)       ¥ 4    
Tranche 16            
STOCK-BASED COMPENSATION            
Grant date       Oct. 02, 2017    
Options outstanding       0 0 0
Number of options granted       0 0 0
Options exercised       0 0 0
Options cancelled/expired       0 0 0
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 0 1,800
Number of options granted       0 0 0
Options exercised       0 0 (1,000)
Options cancelled/expired       0 0 (800)
Options outstanding       0 0 0
Options vested and exercisable       0 0 0
Weighted average fair value at the grant date (USD)       ¥ 4.4    
Tranche 18            
STOCK-BASED COMPENSATION            
Grant date       Jan. 02, 2018    
Options outstanding       0 19,000 19,000
Number of options granted       0 0 0
Options exercised       0 0 0
Options cancelled/expired       0 (19,000) 0
Options outstanding       0 0 19,000
Options vested and exercisable       0 0 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       4,000 20,000 20,000
Number of options granted       0 0 0
Options exercised       0 (10,503) 0
Options cancelled/expired       0 (5,497) 0
Options outstanding       4,000 4,000 20,000
Options vested and exercisable       4,000 4,000 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       (36,000) 0 0
Options outstanding       0 36,000 36,000
Options vested and exercisable       0 36,000 36,000
Weighted average fair value at the grant date (USD)       ¥ 4    
Tranche 21            
STOCK-BASED COMPENSATION            
Grant date       Jan. 02, 2020    
Options outstanding       38,000 38,000 38,000
Number of options granted       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       108,700 123,560 139,070
Number of options granted       0 0 0
Options exercised       0 0 (15,510)
Options cancelled/expired       (1,700) (14,860) 0
Options outstanding       107,000 108,700 123,560
Options vested and exercisable       107,000 108,700 123,560
Weighted average fair value at the grant date (USD)       ¥ 12.5    
Tranche 23            
STOCK-BASED COMPENSATION            
Grant date       Jan. 03, 2022    
Options outstanding       38,000 40,000 0
Number of options granted       0 0 40,000
Options exercised       0 0 0
Options cancelled/expired       0 (2,000) 0
Options outstanding       38,000 38,000 40,000
Options vested and exercisable       38,000 38,000 40,000
Weighted average fair value at the grant date (USD)       ¥ 5.4    
Tranche 24            
STOCK-BASED COMPENSATION            
Grant date       May 22, 2023    
Options outstanding       36,000 0 0
Number of options granted       0 36,000 0
Options exercised       0 0 0
Options cancelled/expired       0 0 0
Options outstanding       36,000 36,000 0
Options vested and exercisable       36,000 36,000 0
Weighted average fair value at the grant date (USD)       ¥ 4.6    
Tranche 25            
STOCK-BASED COMPENSATION            
Grant date       Mar. 01, 2024    
Options outstanding       0 0 0
Number of options granted       20,000 0 0
Options exercised       0 0 0
Options cancelled/expired       0 0 0
Options outstanding       20,000 0 0
Options vested and exercisable       20,000 0 0
Weighted average fair value at the grant date (USD)       ¥ 2.1