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4. Property And Equipment (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Property and equipment, gross $ 45,738 $ 44,727
Less accumulated depreciation (23,453) (22,895)
Total property and equipment 22,285 21,832
Land [Member]    
Property and equipment, gross 1,747 1,747
Buildings And improvements [Member]    
Property and equipment, gross 16,472 16,428
Machinery And Equipment [Member]    
Property and equipment, gross 24,881 23,122
Vehicles [Member]    
Property and equipment, gross 913 848
Office Equipment [Member]    
Property and equipment, gross 717 709
Construction In Progress [Member]    
Property and equipment, gross $ 1,008 $ 1,873