Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Cash flows from operating activities:
Net loss	$ (3,086)	$ (346)
Adjustments to reconcile net loss to operating cash flow:
Depreciation and amortization	3,477	3,112
Non-cash interest expense	14	0
Bad debt expense	21	480
Deferred revenue	(97)	0
Reserve for inventory obsolescence	558	374
Stock-based compensation	802	596
Deferred income taxes	(451)	(352)
(Gain) loss on sale of property and equipment	(54)	38
Goodwill impairment	1,244	0
(Increase) decrease in operating assets:
Accounts receivable	2,379	780
Inventories	1,322	(29)
Refundable income taxes	(401)	(2,038)
Prepaid expenses and other current assets	(78)	(197)
Increase (decrease) in operating liabilities:
Accounts payable	(2,278)	1,130
Accrued expenses	(858)	711
Accrued income taxes	(97)	(451)
Net cash provided by operating activities	2,417	3,808
Cash flows from investing activities:
Purchases of investments	(500)	(25)
Proceeds from sale of investments	500	0
Purchases of property and equipment	(2,824)	(5,341)
Proceeds from sale of property and equipment	104	50
Net cash used in investing activities	(2,720)	(5,316)
Cash flows from financing activities:
Borrowings under revolving credit facility	6,050	0
Payment of deferred financing costs	(69)	0
Purchase of treasury stock	(1,379)	(1,486)
Repayment of notes payable	(6,279)	(840)
Net cash used in financing activities	(1,677)	(2,326)
Net decrease in cash and cash equivalents	(1,980)	(3,834)
Cash and cash equivalents at the beginning of the period	4,978	8,812
Cash and cash equivalents at the end of the period	2,998	4,978
Supplemental cash flow information:
Cash paid for income taxes, net of refunds	723	2,382
Cash paid for interest	$ 261	$ 241