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PROPERTY, PLANT AND EQUIPMENT, NET (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]      
Total property and equipment, gross $ 67,554 $ 65,163  
Less: Accumulated depreciation 46,130 43,842  
Depreciated cost 21,424 21,321  
Depreciation expenses 4,051 3,807 $ 3,501
Land and Buildings [Member]      
Property, Plant and Equipment [Line Items]      
Total property and equipment, gross 13,077 12,385  
Machinery and Equipment [Member]      
Property, Plant and Equipment [Line Items]      
Total property and equipment, gross 51,017 48,848  
Motor Vehicles [Member]      
Property, Plant and Equipment [Line Items]      
Total property and equipment, gross 410 472  
Office Furniture and Equipment [Member]      
Property, Plant and Equipment [Line Items]      
Total property and equipment, gross 1,802 2,039  
Software [Member]      
Property, Plant and Equipment [Line Items]      
Total property and equipment, gross $ 1,248 $ 1,419