CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash flows from operating activities:
Net income (loss)	$ 9,523	$ (320)	$ 2,218
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	10,457	10,862	9,722
Loss on sale or disposal of Property, equipment and leasehold improvements	428	96	343
Deferred income taxes	(5,400)	360	876
Stock-based compensation	1,316	1,087	1,157
Impairment of assets held for sale	493	0	0
Excess tax benefit from employee stock plans	0	0	(44)
Other	539	654	(283)
Changes in operating assets and liabilities:
Accounts receivable, net	(3,776)	(5,082)	(7,185)
Inventories	5,500	(1,614)	1,295
Other current assets	(1,840)	(55)	1,973
Accounts payable and other accrued expenses	277	1,515	3,151
Accrued salaries, wages and payroll taxes	910	(501)	354
Refundable deposits	(1,649)	442	(2,015)
Net cash provided by operating activities	16,778	7,444	11,562
Cash flows from investing activities:
Expenditures for Property, equipment and leasehold improvements	(18,342)	(15,722)	(15,653)
Proceeds from sale of property, equipment and leasehold improvements	95	75	412
Expenditures for long-term deposits	0	(925)	(933)
Payments to Acquire Equity Method Investments	(2,101)	0	0
Net cash used in investing activities	(20,348)	(16,572)	(16,174)
Cash flows from financing activities:
Principal payments on debt and capital lease obligations	(709)	(605)	(1,094)
Net borrowings under revolving line of credit	4,224	9,198	5,737
Proceeds from issuances of common stock	219	172	93
Debt issuance costs	0	0	(87)
Tax payments related to performance shares issued	(27)	(106)	(151)
Excess tax benefit from employee stock plans	0	0	44
Net cash provided by financing activities	3,707	8,659	4,542
Increase (decrease) in Cash and cash equivalents	137	(469)	(70)
Cash and cash equivalents:
Beginning of period	442	911	981
End of period	579	442	911
Supplemental disclosure of cash flow information:
Cash paid for interest	716	667	629
Cash paid for income taxes, net	1,158	587	398
Capital Lease Obligations Incurred	521	1,173	0
Supplemental disclosure of non-cash information:
Purchases of Property, equipment and leasehold improvements included in Accounts payable at end of period	$ 519	$ 889	$ 1,334