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Property, Plant and Equipment, Net (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross $ 25,325 $ 24,018  
Less accumulated depreciation 11,794 10,993  
Fixed assets, net 13,531 13,025  
Depreciation expenses 1,849 1,937 $ 2,166
Land [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross 863 863  
Building [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross 10,764 10,286  
Machinery and Equipment [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross 6,260 5,943  
Office Furniture and Equipment [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross 1,225 1,202  
Computer equipment and software [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross 4,996 4,602  
Automobiles [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross 87 65  
Leasehold Improvements [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross $ 1,130 $ 1,057