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 income (loss)	$ 4,101	$ (1,808)
Adjustments to reconcile net income (loss) to net cash provided by
Depreciation and amortization	6,780	7,528
Deferred financing cost amortization	337	301
Deferred income taxes	1,117	(550)
Stock-based compensation	334	350
Gain on sale of property and equipment	(813)	(512)
Other gain from continuing operations	(5,448)	0
Change in operating assets and liabilities:
Accounts receivable	10,954	18,436
Income tax receivable	(49)	34
Inventory	688	(126)
Prepaid expenses and other	(437)	156
Costs and estimated earnings in excess of billings on uncompleted contracts	3,300	(6,326)
Accounts payable	(9,505)	1,087
Accrued liabilities	(2,283)	(3,990)
Income tax payable	(19)	(419)
Billings in excess of costs and estimated earnings on uncompleted contracts	1,846	(3,117)
Other	(286)	0
Net cash provided by operating activities	10,617	11,044
Cash flows from investing activities:
Proceeds from sale of property and equipment	306	839
Purchase of property and equipment	(4,346)	(2,103)
Contributions to CSV life insurance	(146)	(127)
Proceeds from return of investment	93	0
Insurance claim proceeds related to property and equipment	1,150	0
Net cash used in investing activities	(2,943)	(1,391)
Cash flows from financing activities:
Borrowings from Credit Facility	0	10,000
Payments made on borrowings from Credit Facility	(8,375)	(19,031)
Exercise of stock options	816	623
Net cash used in financing activities	(7,559)	(8,408)
Net change in cash and cash equivalents	115	1,245
Cash and cash equivalents at beginning of period	9,086	305
Cash and cash equivalents at end of period	9,201	1,550
Supplemental disclosures of cash flow information, cash paid during the period for:
Interest	1,163	1,073
Taxes, net of refunds	$ 25	$ (84)