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Inventories (Tables)
 12 Months Ended
Dec. 31, 2017
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Summary of Inventories
    December 31
    2016   2017
    NT$   NT$   US$ (Note 4)
             
Finished goods   $ 6,519,465     $ 6,740,816     $ 227,423  
Work in process     2,822,687       3,452,332       116,475  
Raw materials     10,850,062       12,625,502       425,962  
Supplies     795,093       894,196       30,168  
Raw materials and supplies in transit     450,755       548,065       18,491  
                         
    $ 21,438,062     $ 24,260,911     $ 818,519