v3.21.2
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