Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash flows from operating activities:
Net loss	$ (1,808)	$ (1,208)
Adjustments to reconcile net income (loss) to net cash provided by (used in)
Depreciation and amortization	7,528	8,550
Deferred financing cost amortization	301	303
Deferred income taxes	(550)	(707)
Stock-based compensation	350	433
(Gain) loss on sale of property and equipment	(512)	(372)
Change in operating assets and liabilities:
Accounts receivable	18,436	(3,370)
Income tax receivable	34	0
Inventory	(126)	310
Prepaid expenses and other	156	(307)
Costs and estimated earnings in excess of billings on uncompleted contracts	(6,326)	11,116
Accounts payable	1,087	(13,262)
Accrued liabilities	(3,990)	(4,277)
Income tax payable	(419)	(44)
Billings in excess of costs and estimated earnings on uncompleted contracts	(3,117)	(522)
Net cash provided by (used in) operating activities	11,044	(3,357)
Cash flows from investing activities:
Proceeds from sale of property and equipment	839	634
Contributions to CSV life insurance	(127)	(132)
Purchase of property and equipment	(2,103)	(7,231)
Net cash used in investing activities	(1,391)	(6,729)
Cash flows from financing activities:
Borrowings from Credit Facility	10,000	22,000
Payments made on borrowings from Credit Facility	(19,031)	(11,688)
Exercise of stock options	623	8
Net cash (used in) provided by financing activities	(8,408)	10,320
Net change in cash and cash equivalents	1,245	234
Cash and cash equivalents at beginning of period	305	1,345
Cash and cash equivalents at end of period	1,550	1,579
Supplemental disclosures of cash flow information, cash paid during the period for:
Interest	1,073	1,154
Taxes (net of refunds)	$ (84)	$ 1