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Inventories Related to Real Estate Business (Tables)
 12 Months Ended
Dec. 31, 2021
Text block [abstract]  
Summary of Inventories Related to Real Estate Business
 
                   
                   
                   
 
  
December 31
 
 
  
2020
 
  
2021
 
 
  
NT$
 
  
NT$
 
  
US$ (Note 4)
 
 
  
                      
 
  
                  
 
  
                  
 
Land and buildings held for sale
    $ 625,791      $ 667,630      $ 24,067  
Construction in progress
      11,058,328        2,956,958        106,596  
Land held for construction
      1,787,526        1,787,526        64,439  
    
 
 
     
 
 
     
 
 
  
       
     $ 13,471,645      $ 5,412,114      $ 195,102