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Bonds Payable (Tables)
12 Months Ended
Dec. 31, 2017
Text block1 [abstract]  
Summary of Bonds Payable
    December 31
    2016   2017
    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     $ 236,168  
Repayable at maturity in January 2023 and interest due annually with annual interest rate at 1.50%     2,000,000       2,000,000       67,476  
Repayable at maturity in January 2022 and interest due annually with annual interest rate at 1.25%     -         3,700,000       124,831  
Repayable at maturity in January 2024 and interest due annually with annual interest rate at 1.45%     -         4,300,000       145,074  
Unsecured convertible overseas bonds                        
US$400,000 thousand     12,900,000       -         -    
US$200,000 thousand (linked to New Taiwan dollar)     6,185,600       6,185,600       208,691  
Secured overseas bonds - secured by the Company                        
US$300,000 thousand, interest due semi-annually with annual interest rate at 2.125% and has been repaid in July 2017     9,675,000       -         -    
      37,760,600       23,185,600       782,240  
Less:  discounts on bonds payable     760,697       42,820       1,444  
      36,999,903       23,142,780       780,796  
Less:  current portion     9,658,346       6,161,197       207,868  
                         
    $ 27,341,557     $ 16,981,583     $ 572,928