Condensed Statements Of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash flows used in operating activities
Net loss	$ (31)	$ (202)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	77	79
Deferred income taxes	3	19
Stock-based compensation expense	3	4
Interest accrued on treasury bills	(44)	(22)
Change in:
Trade receivables	(179)	47
Inventories	(20)	(27)
Other current assets	(12)	(30)
Accounts payable	91	(50)
Accrued expenses	12	20
Income tax receivable	(12)	(73)
Net cash used in operating activities	(112)	(235)
Cash flows from investing activities
Purchases of treasury bills	(3,945)	(3,973)
Proceeds from the maturity of treasury bills	4,000	4,000
Purchase of property and equipment	(45)	(4)
Net cash from investing activities	10	23
Cash flows used in financing activities
Payments on financing lease	(1)	0
Payment of contingent earn-out	0	(150)
Net cash used in financing activities	(1)	(150)
Net decrease in cash and cash equivalents	(103)	(362)
Cash and cash equivalents, beginning	1,057	963
Cash and cash equivalents, ending	954	601
Supplemental cash flow information
Cash paid for income taxes	$ 0	$ 0