Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
OPERATING ACTIVITIES
Net income (loss)	$ 148	$ (711)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation	704	804
Amortization of finite-lived intangible assets	68	66
Gain on disposal of assets	(110)	(67)
Impairment of note receivable	0	43
Stock-based compensation	67	265
Bargain purchase gain	(4)	0
Deferred income tax benefit	(214)	0
Dividend from marketable securities	(62)	0
Changes in operating assets and liabilities:
(Increase) decrease in accounts receivable, net	(890)	660
(Increase) decrease in inventories, net	(62)	625
(Increase) decrease in prepaid expenses and other assets	(1)	13
Increase (decrease) in accounts payable, accrued compensation and commissions expense and other accrued liabilities	634	(1,009)
Net cash provided by operating activities	278	689
INVESTING ACTIVITIES
Purchase of marketable securities	(2,695)	0
Capital expenditures	(172)	(422)
Acquisition of a business	(295)	0
Other	117	94
Net cash used in investing activities	(3,045)	(328)
FINANCING ACTIVITIES
Purchase of treasury stock	(8)	0
Net cash used in financing activities	(8)	0
(Decrease) increase in cash and cash equivalents	(2,775)	361
Cash and cash equivalents at beginning of period	5,553	5,192
Cash and cash equivalents at end of period	2,778	5,553
Supplemental Disclosure:
Cash paid for income taxes	17	21
Cash paid for interest	52	30
Supplemental Schedule of Noncash Investing Activities:
Fair value of equipment acquired	85	0
Fair value of intangible assets acquired	214	0
Current assets acquired	45	0
Current liabilities assumed	(45)	0
Bargain purchase gain	(4)	0
Cash consideration paid	$ 295	$ 0