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4. Property, Plant and Equipment, net (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Property and equipment, gross $ 51,960 $ 51,558
Less accumulated depreciation (30,050) (29,284)
Total property and equipment 21,910 22,274
Land [Member]    
Property and equipment, gross 1,565 1,565
Buildings And improvements [Member]    
Property and equipment, gross 17,420 17,332
Machinery And Equipment [Member]    
Property and equipment, gross 31,085 30,670
Vehicles [Member]    
Property and equipment, gross 778 778
Office Equipment [Member]    
Property and equipment, gross 851 851
Construction In Progress [Member]    
Property and equipment, gross $ 261 $ 362