CONDENSED STATEMENTS OF CASH FLOWS (unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Cash flows from (used in) operating activities
Net income (loss)	$ 80	$ (171)
Adjustments to reconcile net income (loss) to net cash from (used in) operating activities:
Depreciation and amortization	69	117
Deferred income taxes	58	(15)
Stock-based compensation expense	38	4
Interest accrued on Treasury Bills	(163)	(8)
Change in:
Trade receivables	95	(175)
Inventories	(91)	(127)
Other current assets	(65)	13
Accounts payable	(13)	(48)
Accrued expenses	209	250
Income tax receivable/payable	(125)	(53)
Net cash from (used in) operating activities	92	(213)
Cash flows from (used in) investing activities
Purchases of Treasury Bills	(13,830)	(4,992)
Proceeds from the maturity of Treasury Bills	10,000	8,000
Purchase of property and equipment	(1)	(17)
Net cash from (used in) investing activities	(3,831)	2,991
Cash flows from (used in) financing activities
Proceeds from the exercise of common stock options	0	31
Payments on financing lease	(5)	(4)
Net cash from (used in) financing activities	(5)	27
Net increase (decrease) in cash and cash equivalents	(3,744)	2,805
Cash and cash equivalents, beginning	7,646	6,713
Cash and cash equivalents, ending	3,902	9,518
Supplemental cash flow information
Cash paid for income taxes	164	22
Cash paid for interest	$ 1	$ 1