Condensed Statements Of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Cash flows used in operating activities
Net income (loss)	$ 72	$ (245)
Adjustments to reconcile net income (loss) to net cash used in operating activities:
Depreciation and amortization	154	158
Deferred income taxes	(13)	(3)
Stock-based compensation expense	5	6
Interest accrued on treasury bills	(84)	(43)
Change in:
Trade receivables	(399)	79
Inventories	(94)	(88)
Other current assets	0	16
Accounts payable	125	(25)
Accrued expenses	150	84
Income tax receivable/payable	32	(19)
Net cash used in operating activities	(52)	(80)
Cash flows from investing activities
Purchases of treasury bills	(6,916)	(6,697)
Proceeds from the maturity of treasury bills	7,000	6,750
Purchase of property and equipment	(61)	(28)
Net cash from investing activities	23	25
Cash flows used in financing activities
Payments on financing lease	(3)	0
Payment of contingent earn-out	0	(150)
Net cash used in financing activities	(3)	(150)
Net decrease in cash and cash equivalents	(32)	(205)
Cash and cash equivalents, beginning	1,057	963
Cash and cash equivalents, ending	1,025	758
Supplemental cash flow information
Cash paid for income taxes	1	0
Cash paid for interest	$ 1	$ 0