| b. | Revenue from major products and services |
| For the Year Ended December 31 | ||||||||||||||||
| 2015 | 2016 | 2017 | ||||||||||||||
| NT$ | NT$ | NT$ | US$ (Note 4) | |||||||||||||
| Packaging service | $ | 116,607,314 | $ | 125,282,829 | $ | 126,225,119 | $ | 4,258,607 | ||||||||
| Testing service | 25,191,916 | 27,031,750 | 26,157,277 | 882,499 | ||||||||||||
| Electronic components manufacturing service | 138,242,100 | 115,395,130 | 133,948,016 | 4,519,164 | ||||||||||||
| Others | 3,261,206 | 7,174,398 | 4,110,796 | 138,691 | ||||||||||||
| $ | 283,302,536 | $ | 274,884,107 | $ | 290,441,208 | $ | 9,798,961 | |||||||||