Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Current Assets:
Cash and cash equivalents	$ 21,500	$ 21,507
Marketable securities	16,887	16,585
Accounts receivable, net of allowances of $84 and $86, respectively	509	543
Inventories, net	237	265
Prepaid expenses and other current assets	551	440
Total Current Assets	39,684	39,340
Net property, plant, and equipment	1	1
Right-of-use lease assets	103	132
Intangible assets, net	73	78
Deferred income tax assets	206	234
Total Assets	40,067	39,785
Current Liabilities:
Accounts payable	361	310
Accrued compensation and commissions	144	170
Income taxes payable	0	1
Other accrued expenses	272	106
Total Current Liabilities	777	587
Other liabilities	643	708
Total Liabilities	1,420	1,295
Contingencies (Note L)
Stockholders’ Equity
Common stock, $0.01 par value - 30,000,000 shares authorized; 5,434,521 shares issued and 5,352,937 shares outstanding at March 31, 2023, and 5,434,521 shares issued and 5,352,937 shares outstanding at December 31, 2022	53	53
Additional paid-in capital	46,346	46,346
Retained earnings	(7,172)	(7,329)
Treasury stock, 81,584 shares held in treasury at cost at March 31, 2023 and December 31, 2022	(580)	(580)
Total Stockholders' Equity	38,647	38,490
Total Liabilities and Stockholders' Equity	$ 40,067	$ 39,785