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FIXED ASSETS, NET (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]      
Cost $ 46,268 $ 41,155  
Accumulated depreciation (37,682) (32,702)  
Depreciated costs 8,586 8,453  
Depreciation expense 2,080 1,856 $ 1,731
Machinery And Equipment [Member]      
Property, Plant and Equipment [Line Items]      
Cost 36,890 32,751  
Accumulated depreciation (29,805) (25,890)  
Leasehold Improvements [Member]      
Property, Plant and Equipment [Line Items]      
Cost 9,044 8,124  
Accumulated depreciation (7,625) (6,598)  
Motor Vehicles [Member]      
Property, Plant and Equipment [Line Items]      
Cost 74 46  
Accumulated depreciation (48) (37)  
Office Furniture and Equipment [Member]      
Property, Plant and Equipment [Line Items]      
Cost 260 234  
Accumulated depreciation $ (204) $ (177)