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4. Property And Equipment (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Property, plant and equipment, gross $ 50,631 $ 49,864
Less accumulated depreciation (25,804) (25,219)
Property, plant and equipment, net 24,827 24,645
Land [Member]    
Property, plant and equipment, gross 1,747 1,747
Buildings And improvements [Member]    
Property, plant and equipment, gross 17,323 17,260
Machinery And Equipment [Member]    
Property, plant and equipment, gross 28,158 27,539
Vehicles [Member]    
Property, plant and equipment, gross 901 901
Office Equipment [Member]    
Property, plant and equipment, gross 734 734
Construction In Progress [Member]    
Property, plant and equipment, gross $ 1,768 $ 1,683