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PROPERTY AND EQUIPMENT, NET (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]      
Cost $ 50,874 $ 45,792  
Accumulated depreciation (43,611) (39,031)  
Depreciated costs 7,263 6,761  
Depreciation expense 1,591 1,508 $ 1,649
Machinery And Equipment [Member]      
Property, Plant and Equipment [Line Items]      
Cost 40,268 35,999  
Accumulated depreciation (33,892) (30,349)  
Leasehold Improvements [Member]      
Property, Plant and Equipment [Line Items]      
Cost 9,656 8,917  
Accumulated depreciation (8,991) (8,019)  
Motor Vehicles [Member]      
Property, Plant and Equipment [Line Items]      
Cost 81 77  
Accumulated depreciation (56) (59)  
Office furniture and equipment [Member]      
Property, Plant and Equipment [Line Items]      
Cost 869 799  
Accumulated depreciation $ (672) $ (604)