Summary of Significant Accounting Policies (Details Textual) - HKD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
|
| Significant Accounting Policies [Line Items] | |||
| Foreign Currency Transaction Gain (Loss), Realized | $ (4,004) | $ 3,670 | $ 1,564 |