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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]      
Property, Plant and Equipment, Gross $ 28,009 $ 26,084  
Less accumulated depreciation 10,892 10,581  
Fixed assets, net 17,117 15,503  
Depreciation expenses 1,868 2,001 $ 1,820
Construction in progress 2,327 2,044  
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 14,099 13,307  
Machinery and Equipment [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross 7,331 6,406  
Office Furniture and Equipment [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross 624 758  
Computer equipment and software [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross 4,383 4,310  
Automobiles [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross 87 87  
Leasehold Improvements [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross $ 622 $ 353