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6. Property And Equipment (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Property and equipment, gross $ 44,727 $ 43,419
Less accumulated depreciation (22,895) (22,044)
Total property and equipment 21,832 21,375
Land [Member]    
Property and equipment, gross 1,747 1,807
Buildings And improvements [Member]    
Property and equipment, gross 16,428 16,387
Machinery And Equipment [Member]    
Property and equipment, gross 23,122 22,907
Vehicles [Member]    
Property and equipment, gross 848 1,298
Office Equipment [Member]    
Property and equipment, gross 709 709
Construction In Progress [Member]    
Property and equipment, gross $ 1,873 $ 311