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Bonds Payable (Tables)
 12 Months Ended
Dec. 31, 2018
Text block [abstract]  
Summary of Bonds Payable
    December 31
    2017   2018
    NT$   NT$   US$ (Note 4)
             
Unsecured domestic bonds            
Repayable at maturity in January 2021 and interest due annually with annual interest rate at 1.30%   $ 7,000,000     $ 7,000,000     $ 228,683  
Repayable at maturity in January 2023 and interest due annually with annual interest rate at 1.50%     2,000,000       2,000,000       65,338  
Repayable at maturity in January 2022 and interest due annually with annual interest rate at 1.25%     3,700,000       3,700,000       120,876  
Repayable at maturity in January 2024 and interest due annually with annual interest rate at 1.45%     4,300,000       4,300,000       140,477  

 

  December 31
    2017   2018
    NT$   NT$   US$ (Note 4)
             
Unsecured convertible overseas bonds            
US$200,000 thousand (linked to New Taiwan dollar)   $ 6,185,600     $ -       $ -    
      23,185,600       17,000,000       555,374  
Less: discounts on bonds payable     42,820       14,064       459  
      23,142,780       16,985,936       554,915  
Less: current portion     6,161,197       -         -    
                         
    $ 16,981,583     $ 16,985,936     $ 554,915