| 8. | AVAILABLE-FOR-SALE FINANCIAL ASSETS |
| December 31 | ||||||||||||
| 2016 | 2017 | |||||||||||
| NT$ | NT$ | US$ (Note 4) | ||||||||||
| Unquoted ordinary shares | $ | 553,350 | $ | 605,110 | $ | 20,415 | ||||||
| Quoted ordinary shares | 146,786 | 279,791 | 9,440 | |||||||||
| Limited partnership | 273,372 | 246,072 | 8,302 | |||||||||
| Unquoted preferred shares | 78,068 | 57,367 | 1,935 | |||||||||
| Open-end mutual funds | 243,458 | 23,825 | 804 | |||||||||
| 1,295,034 | 1,212,165 | 40,896 | ||||||||||
| Current | 266,696 | 89,159 | 3,008 | |||||||||
| Non-current | $ | 1,028,338 | $ | 1,123,006 | $ | 37,888 | ||||||