Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Current Assets:
Cash and cash equivalents	$ 21,652	$ 29,016
Marketable securities	22,815	16,167
Accounts receivable, net of allowances of $202 and $208, respectively	5,255	4,667
Inventories, net	5,919	5,492
Prepaid expenses and other current assets	467	494
Total Current Assets	56,108	55,836
Property, plant and equipment:
Land	536	536
Buildings and improvements	4,869	4,869
Machinery and equipment	19,022	18,815
Gross property, plant and equipment	24,427	24,220
Less: accumulated depreciation	(20,985)	(20,837)
Net property, plant, and equipment	3,442	3,383
Right-of-use lease assets	369	396
Intangible assets, net	234	252
Deferred income tax assets	75	34
Other assets	1	5
Total Assets	60,229	59,906
Current Liabilities:
Accounts payable	1,568	1,455
Accrued compensation and commissions	1,084	1,549
Income taxes payable	801	599
Other accrued expenses	1,044	823
Total Current Liabilities	4,497	4,426
Deferred income tax liability		124
Long-term lease liabilities	587	613
Total Liabilities	5,084	5,163
Contingencies (Note M)
Stockholders’ Equity
Common stock, $0.01 par value - 30,000,000 shares authorized; 5,446,840 shares issued and 5,323,973 shares outstanding at March 31, 2022, and 5,446,840 shares issued and 5,308,973 shares outstanding at December 31, 2021	53	53
Additional paid-in capital	46,050	45,817
Retained earnings	9,622	9,453
Treasury stock, 81,584 shares held in treasury at cost at March 31, 2022 and December 31, 2021	(580)	(580)
Total Stockholders' Equity	55,145	54,743
Total Liabilities and Stockholders' Equity	$ 60,229	$ 59,906