Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Operating Activities:
Net (loss) income from continuing operations	$ (858)	$ 184
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation	674	628
Intangible asset amortization	290	290
Stock-based compensation	668	708
Loss on disposal of property and equipment	10	0
Restructuring costs	(11)	(33)
Bad debt provision	15	(7)
Deferred tax provision	(236)	(276)
Changes in operating assets and liabilities:
Accounts receivable	(350)	794
Inventories	321	1,790
Prepaid expenses and other assets	(250)	319
Accounts payable	(64)	(812)
Income taxes payable	(3)	(70)
Other accrued liabilities	(1,808)	(1,467)
Deferred revenue	14	(12)
Net cash (used in) provided by operating activities	(1,588)	2,036
Investing Activities:
Capital expenditures	(884)	(1,052)
Proceeds from disposal of property and equipment	14	0
Purchases of investments	(7,266)	(9,743)
Redemptions/maturities of short-term investments	17,480	10,197
Net cash provided by (used in) investing activities	9,344	(598)
Financing Activities:
Proceeds from issuance of common stock	364	330
Payment of withholding tax on stock-based compensation	(289)	(614)
Principle payments on capital leases	(24)	(19)
Cash dividends	(995)	(865)
Net cash used in financing activities	(944)	(1,168)
Cash flows from discontinued operations:
Net cash used in operating activities	0	(174)
Net cash used in investing activities	0	(1)
Net cash flows used in discontinued operations	0	(175)
Net increase in cash and cash equivalents	6,812	95
Effect of exchange rate changes on cash	81	10
Cash and cash equivalents, beginning of year	5,559	14,855
Cash and Cash Equivalents, End of Period	$ 12,452	$ 14,960