Property, Plant and Equipment (Details Textual) - HKD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
|
| Property, Plant and Equipment [Member] | |||
| Property, Plant and Equipment [Line Items] | |||
| Depreciation, Depletion and Amortization, Nonproduction | $ 7,264 | $ 7,245 | $ 6,839 |