CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash flows from operating activities:
Net income (loss)	$ 4,142	$ 9,523	$ (320)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	10,612	10,457	10,862
(Gain) loss on sale or disposal of Property, equipment and leasehold improvements	(567)	428	96
Deferred income taxes	(506)	(5,400)	360
Stock-based compensation	1,484	1,316	1,087
Impairment of assets held for sale	0	493	0
Other	503	539	654
Changes in operating assets and liabilities:
Accounts receivable, net	(2,770)	(3,776)	(5,082)
Inventories	(2,728)	5,500	(1,614)
Other current assets	466	(1,840)	(55)
Accounts payable, deferred revenue and other accrued expenses	3,488	277	1,515
Accrued salaries, wages and payroll taxes	(266)	910	(501)
Refundable deposits	(617)	(1,649)	442
Net cash provided by operating activities	13,241	16,778	7,444
Cash flows from investing activities:
Expenditures for Property, equipment and leasehold improvements	(12,769)	(18,342)	(15,722)
Proceeds from sale of Property, equipment and leasehold improvements	23,017	95	75
Restricted cash from sale of Property, equipment and leasehold improvements	515	0	0
Business combinations and asset acquisitions	(37,887)	0	0
Expenditures for long-term deposits	0	0	(925)
Equity method investment	0	(2,101)	0
Net cash used in investing activities	(27,124)	(20,348)	(16,572)
Cash flows from financing activities:
Principal payments on debt and capital lease obligations	(724)	(709)	(605)
Net borrowings under revolving line of credit	14,893	4,224	9,198
Proceeds from issuances of common stock	427	219	172
Tax payments related to performance shares issued	(92)	(27)	(106)
Net cash provided by financing activities	14,504	3,707	8,659
Increase (decrease) in Cash, cash equivalents and restricted cash	621	137	(469)
Cash, cash equivalents and restricted cash:
Beginning of period	579	442	911
End of period	1,200	579	442
Supplemental disclosure of cash flow information:
Cash paid for interest	576	716	667
Cash paid for income taxes, net	1,078	1,158	587
Supplemental disclosure of non-cash information:
Purchases of Property, equipment and leasehold improvements with capital leases	0	521	1,173
Purchases of Property, equipment and leasehold improvements included in Accounts payable at end of period	$ 3,061	$ 519	$ 889