INCOME TAXES (Deferred Tax Liabilities and Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Deferred Tax Liabilities [Abstract]
Property and equipment	$ (300)	$ (935)
Gross deferred tax liabilities	(300)	(935)
Deferred tax assets
Intangibles and goodwill	1,178	2,038
Accrued property taxes	6	53
Allowance for doubtful accounts	16	14
Inventory capitalization	72	110
Stock options	424	605
Federal net operating loss carry forward	3,901	4,706
State net operating loss carry forward	1,787	1,658
State recycling equipment tax credit carry forward	4,590	4,593
Inventory valuation reserve	0	60
Accrued expenses	160	187
Other	8	11
Gross deferred tax assets	12,142	14,035
Valuation allowance	(11,815)	(13,073)	$ (12,665)
Net deferred tax assets	$ 27	$ 27