Condensed Statements Of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Cash flows from (used in) operating activities
Net income (loss)	$ (171)	$ 229
Adjustments to reconcile net income (loss) to net cash from (used in) operating activities:
Depreciation and amortization	117	254
Deferred income taxes	(15)	(24)
Stock-based compensation expense	4	4
Interest accrued on treasury bills	(8)	(2)
Loss on disposal of fixed assets	0	8
Change in:
Trade receivables	(175)	(368)
Inventories	(127)	95
Other current assets	13	(37)
Accounts payable	(48)	(22)
Accrued expenses	250	299
Income tax receivable/payable	(53)	111
Net cash from (used in) operating activities	(213)	547
Cash flows from investing activities
Purchases of treasury bills	(4,992)	(10,999)
Proceeds from the maturity of treasury bills	8,000	14,000
Purchase of property and equipment	(17)	(14)
Net cash from investing activities	2,991	2,987
Cash flows from (used in) financing activities
Proceeds from the exercise of common stock options	31	0
Payments on financing lease	(4)	(4)
Net cash from (used in) financing activities	27	(4)
Net increase in cash and cash equivalents	2,805	3,530
Cash and cash equivalents, beginning	6,713	1,090
Cash and cash equivalents, ending	9,518	4,620
Supplemental cash flow information
Cash paid for income taxes	22	1
Cash paid for interest	$ 1	$ 1