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ACCRUED LIABILITIES (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
ACCRUED LIABILITIES      
Accrued payroll and benefits $ 2,126 $ 1,797  
Accrued property taxes   144  
Income taxes payable 66 77  
Accrued professional fees 101 40  
Accrued warranty liability 226 581 $ 671
Accrued self-insurance reserve 374 812  
Accrued other 913 942  
Total accrued liabilities $ 3,806 $ 4,393