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PROPERTY, PLANT AND EQUIPMENT, NET (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]      
Total property and equipment, gross $ 65,163 $ 61,737  
Less: Accumulated depreciation 43,842 40,439  
Depreciated cost 21,321 21,298  
Depreciation expenses 3,807 3,501 $ 2,753
Land and Buildings [Member]      
Property, Plant and Equipment [Line Items]      
Total property and equipment, gross 12,385 11,966  
Machinery and Equipment [Member]      
Property, Plant and Equipment [Line Items]      
Total property and equipment, gross 48,848 46,129  
Motor Vehicles [Member]      
Property, Plant and Equipment [Line Items]      
Total property and equipment, gross 472 362  
Office Furniture and Equipment [Member]      
Property, Plant and Equipment [Line Items]      
Total property and equipment, gross 2,039 1,926  
Software [Member]      
Property, Plant and Equipment [Line Items]      
Total property and equipment, gross $ 1,419 $ 1,354