ACCRUED LIABILITIES (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
ACCRUED LIABILITIES
Accrued payroll and benefits	$ 1,817	$ 1,797
Accrued property taxes	471	144
Income taxes payable	3	77
Accrued professional fees	43	40
Accrued warranty liability	593	581	$ 592	$ 671
Accrued self-insurance reserve	493	812
Accrued other	1,298	942
Total accrued liabilities	$ 4,718	$ 4,393