Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash flows from operating activities
Net income	$ 928	$ 2,723
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation and amortization	5,704	6,192
Amortization of ROU operating leases	1,348	1,673
Amortization of ROU finance leases	781	700
Amortization of deferred debt issuance costs	239	123
Deferred income taxes	50	13
Stock-based compensation	383	462
Gain on disposal of assets, net	(1,610)	(992)
Allowance for credit losses		411
Change in operating assets and liabilities:
Accounts receivable	3,837	13,511
Income tax receivable		(192)
Inventory	74	(218)
Prepaid expenses and other	60	1,540
Contract assets	10,474	9,956
Accounts payable	(9,735)	(22,911)
Accrued liabilities	(2,371)	(543)
Operating lease liabilities	(1,196)	(1,348)
Income tax payable	137	(278)
Contract liabilities	15	4,631
Net cash provided by operating activities	9,118	15,453
Cash flows from investing activities:
Proceeds from sale of property and equipment	1,950	1,302
Purchase of property and equipment	(1,618)	(2,753)
Contributions to CSV life insurance	0	(38)
Insurance claim proceeds related to property and equipment	440	1,164
Net cash provided by (used in) investing activities	772	(325)
Cash flows from financing activities:
Borrowings from Credit Facility	5,000	5,000
Payments made on borrowings from Credit Facility	(11,155)	(6,750)
Payments of finance lease liabilities	(732)	(942)
Payments related to tax withholding for stock-based compensation	(36)
Exercise of stock options	86
Net cash used in by financing activities	(6,837)	(2,692)
Net change in cash and cash equivalents	3,053	12,436
Cash and cash equivalents at beginning of period	1,589	1,086
Cash and cash equivalents at end of period	4,642	13,522
Cash and cash equivalents	4,642	12,591
Restricted cash		931
Supplemental disclosures of cash flow information, cash paid during the period for:
Interest	443	942
Taxes, net of refunds	$ (37)	$ 648