Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Cash flows from operating activities:
Net income	$ 1,260	$ 2,893
Adjustments to reconcile net income from continuing operations to net cash provided by operating activities:
Depreciation and amortization	190	65
Stock based compensation	122	119
Changes in operating assets and liabilities:
Accounts receivable	352	(127)
Inventories	73	(253)
Prepaid expenses and other current assets	39	(79)
Other assets	(2)	(31)
Accounts payable	(69)	(160)
Accrued liabilities	11	30
Accrued income taxes	(1)	104
Deferred income taxes	182	(675)
Deferred revenue	(111)
Net cash provided by operating activities	2,046	1,886
Cash flows from investing activities:
Property, plant and equipment	(394)	(191)
Intangibles	(35)	(39)
Net cash used in investing activities	(429)	(230)
Cash flows from financing activities:
Proceeds from exercise of stock options	34
Net cash provided by financing activities	34
Effect of exchange rate changes on cash and cash equivalents	112	(77)
Net increase in cash and cash equivalents	1,763	1,579
Cash, cash equivalents and restricted cash, beginning of period	6,014	4,435
Cash, cash equivalents and restricted cash, end of period	7,777	6,014
Supplemental disclosure of cash flow information:
Income taxes paid	$ 687	$ 587