Statements Of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash flows used in operating activities
Net loss	$ (202)	$ (84)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	79	78
Deferred income taxes	19	(35)
Stock-based compensation expense	4	17
Other	(22)	(8)
Change in:
Trade receivables	47	(57)
Inventories	(27)	(35)
Other current assets	(30)	(2)
Accounts payable	(50)	(97)
Accrued expenses	20	66
Income tax receivable	(73)	(14)
Net cash used in operating activities	(235)	(171)
Cash flows from investing activities
Purchases of treasury bills	(3,973)	(1,987)
Proceeds from the maturity of treasury bills	4,000	2,000
Purchase of property and equipment	(4)	(12)
Net cash from investing activities	23	1
Cash flows used in financing activities
Payment of contingent earn-out	(150)	0
Net cash used in financing activities	(150)	0
Net decrease in cash and cash equivalents	(362)	(170)
Cash and cash equivalents, beginning	963	840
Cash and cash equivalents, ending	601	670
Supplemental cash flow information
Cash paid for income taxes	$ 0	$ 1