Statements Of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Cash flows from (used in) operating activities
Net income	$ 275	$ 100
Adjustments to reconcile net income to net cash from (used in) operating activities:
Depreciation and amortization	94	145
Deferred income taxes	(99)	(48)
Stock-based compensation expense	67	3
Interest accrued on Treasury Bills	(191)	(8)
Change in:
Trade receivables	(122)	(156)
Inventories	(6)	(82)
Other current assets	35	(26)
Accounts payable	17	(75)
Accrued expenses	(27)	8
Income taxes payable/receivable	87	(8)
Net cash from (used in) operating activities	130	(147)
Cash flows from investing activities
Purchases of Treasury Bills	(13,830)	(6,971)
Proceeds from the maturity of Treasury Bills	16,000	8,000
Purchase of property and equipment	(70)	(65)
Net cash from investing activities	2,100	964
Cash flows from (used in) financing activities
Payments on financing lease	(6)	(6)
Proceeds from the exercise of common stock options	0	122
Net cash from (used in) financing activities	(6)	116
Net increase in cash and cash equivalents	2,224	933
Cash and cash equivalents, beginning	7,646	6,713
Cash and cash equivalents, ending	9,870	7,646
Supplemental cash flow information
Cash paid during the year for income taxes	115	28
Cash paid during the year for interest	$ 1	$ 1