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ACCRUED LIABILITIES (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
ACCRUED LIABILITIES      
Accrued payroll and benefits $ 4,422 $ 3,675  
Accrued property taxes 99 128  
Income taxes payable 127 155  
Accrued professional fees 236 74  
Accrued warranty liability 671 601 $ 1,054
Accrued regulatory settlement 500 500  
Accrued environmental reserve 1,241 1,300  
Accrued self-insurance reserve 909 1,464  
Accrued other 225 237  
Total accrued liabilities $ 8,430 $ 8,134