Condensed Statements Of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Cash flows from (used in) operating activities
Net income (loss)	$ (293)	$ 212
Adjustments to reconcile net income (loss) to net cash from (used in) operating activities:
Depreciation and amortization	78	181
Deferred income taxes	(18)	(28)
Stock-based compensation expense	2	3
Interest accrued on treasury bills	(2)	(2)
Change in:
Trade receivables	(318)	(455)
Inventories	(57)	47
Other current assets	17	(6)
Accounts payable	(30)	137
Accrued expenses	427	293
Income tax receivable/payable	(78)	84
Net cash from (used in) operating activities	(272)	466
Cash flows used in investing activities
Purchases of treasury bills	(4,992)	(8,999)
Proceeds from the maturity of treasury bills	5,000	9,000
Purchase of property and equipment	(17)	(14)
Net cash used in investing activities	(9)	(13)
Cash flows used in financing activities
Payments on financing lease	(3)	(3)
Net cash used in financing activities	(3)	(3)
Net increase (decrease) in cash and cash equivalents	(284)	450
Cash and cash equivalents, beginning	6,713	1,090
Cash and cash equivalents, ending	6,429	1,540
Supplemental cash flow information
Cash paid for income taxes	$ 17	$ 1