CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash flows from operating activities:
Net (loss) income	$ (850)	$ 64
Adjustments to reconcile net (loss) income to net cash provided by (used in) operating activities:
Share-based compensation	4	34
Depreciation and amortization	431	389
Changes in assets and liabilities:
Accounts receivable, net of allowance	(1,368)	1,580
Costs and estimated earnings in excess of billings on uncompleted contracts	666	56
Prepaid expenses and other current assets	64	67
Other assets	37	(7)
Accounts payable and accrued liabilities	(238)	(105)
Billings in excess of costs and estimated earnings on uncompleted contracts	(505)	(1,735)
Net cash (used in) provided by operating activities	(1,759)	343
Cash flows from investing activities:
Purchases of property, plant and equipment	(277)	(456)
Repayments received on notes receivable	4	6
Net cash used in investing activities	(273)	(450)
Cash flows from financing activities:
Principal payment on long-term debt	(1)	0
Cash paid for purchase of our common stock	0	(83)
Net cash used in financing activities	(1)	(83)
Change in cash	(2,033)	(190)
Cash, beginning of period	3,939	8,203
Cash, end of period	1,906	8,013
Supplemental schedule of investing and financing activities:
Financing of property, plant and equipment (non-cash)	$ 67	$ 0