Other Accrued Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Other Accrued Liabilities [Abstract]
Accrued expenses	$ 453	$ 462
Self-insurance accruals	648	679
Customer deposits	39	0
Other accrued liabilities	218	189
Total other accrued liabilities	$ 1,358	$ 1,330