Property, plant and equipment (Parenthetical) (Details) $ in Thousands, $ in Thousands |
1 Months Ended | 12 Months Ended | ||||
|---|---|---|---|---|---|---|
|
Dec. 31, 2020
HKD ($)
|
Dec. 31, 2019
HKD ($)
|
Dec. 31, 2020
HKD ($)
|
Dec. 31, 2019
HKD ($)
|
Dec. 31, 2020
USD ($)
|
Dec. 31, 2019
USD ($)
|
|
| Long-term bank loan | $ 6,040 | $ 6,255 | ||||
| Luk Lai Ching Kimmy | ||||||
| Shareholding percentage held | 4.20% | 5.30% | 4.20% | 5.27% | ||
| Asset Pledged as Collateral [Member] | OCBC Wing Hang Bank Limited [Member] | ||||||
| Long-term bank loan | $ 50,000 | $ 50,000 | $ 50,000 | $ 50,000 | 6,410 | 6,410 |
| Asset Pledged as Collateral [Member] | United Overseas Bank Limited [Member] | ||||||
| Long-term bank loan | $ 127,540 | $ 127,540 | $ 127,540 | $ 127,540 | 16,350 | 16,350 |
| Leasehold land and buildings | OCBC Wing Hang Bank Limited [Member] | ||||||
| Carrying value | 47,670 | 50,240 | ||||
| Leasehold land and buildings | United Overseas Bank Limited [Member] | ||||||
| Carrying value | $ 4,370 | $ 4,720 | ||||