Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
OPERATING ACTIVITIES
Net loss	$ (5,865,000)	$ (6,893,000)
Net loss from discontinued operations	(848,000)	(973,000)
Net loss from continuing operations	(5,017,000)	(5,920,000)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	5,989,000	5,833,000
(Gain) loss on disposal of equipment	(108,000)	62,000
Change in fair value of warrants	540,000	524,000
Deferred income taxes		146,000
Stock-based compensation	393,000	704,000
Amortization of debt issuance costs and discount	297,000	484,000
Provision for bad debt expense	43,000	37,000
Changes in operating assets and liabilities
Accounts receivable	1,691,000	(6,845,000)
Inventories	38,000	(166,000)
Prepaid expenses and other current assets	1,082,000	133,000
Income taxes receivable	(28,000)	111,000
Other assets	(120,000)	(403,000)
Accounts payable and accrued liabilities	(2,616,000)	2,446,000
Other liabilities	25,000
Net cash provided by (used in) operating activities - continuing operations	2,209,000	(2,854,000)
Net cash used in operating activities - discontinued operations	(873,000)	(1,135,000)
Net cash provided by (used in) operating activities	1,336,000	(3,989,000)
INVESTING ACTIVITIES
Acquisition of Adler Hot Oil Service, LLC	(6,164,000)
Purchases of property and equipment	(1,781,000)	(1,677,000)
Proceeds from insurance claims	122,000	183,000
Proceeds from disposal of equipment	578,000	279,000
Net cash used in investing activities - continuing operations	(7,245,000)	(1,215,000)
Net cash used in investing activities - discontinued operations	(29,000)	(89,000)
Net cash used in investing activities	(7,274,000)	(1,304,000)
FINANCING ACTIVITIES
Stock issuance costs and registration fees		(1,000)
Net line of credit borrowings	6,728,000	4,312,000
Proceeds from issuance of long-term debt		1,000,000
Repayment of note payable	(800,000)
Repayment of long-term debt	(93,000)	(189,000)
Other financing	(31,000)	(59,000)
Net cash provided by financing activities	5,804,000	5,063,000
Net decrease in Cash and Cash Equivalents	(134,000)	(230,000)
Cash and Cash Equivalents, beginning of period	391,000	621,000
Cash and Cash Equivalents, end of period	257,000	391,000
Supplemental cash flow information:
Cash paid for interest	1,838,000	674,000
Cash paid (refunded) for income taxes	32,000	(222,000)
Supplemental Disclosure of Non-cash Investing and Financing Activities:
Non-cash proceeds from revolving credit facilities	141,000	1,124,000
Cashless exercise of stock options	994,000
Non-cash proceeds from warrant exercise	500,000
Non-cash subordinated debt principal repayment	(500,000)
Non-cash conversion of warrant liability to equity	1,371,000
Non-cash proceeds from subordinated debt borrowings	4,800,000	1,500,000
Non-cash repayment of revolving credit facility		$ (1,500,000)