Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Current Assets:
Cash and cash equivalents	$ 15,254	$ 18,331
Marketable securities	5,993	5,791
Accounts receivable, net of allowances of $196 and $189, respectively	4,654	4,122
Inventories, net	5,548	5,280
Prepaid expenses and other current assets	270	257
Total Current Assets	31,719	33,781
Property, plant and equipment:
Land	536	536
Buildings and improvements	4,822	4,810
Machinery and equipment	18,162	17,775
Gross property, plant and equipment	23,520	23,121
Less: accumulated depreciation	(20,568)	(20,336)
Net property, plant, and equipment	2,952	2,785
Right-of-use lease assets	362	422
Equity investment in unconsolidated subsidiary	5,045	3,072
Intangible assets, net	290	327
Deferred income taxes, net	2,996	3,052
Other assets	35	16
Total Assets	43,399	43,455
Current Liabilities:
Accounts payable	1,568	1,265
Accrued compensation and commissions	1,104	1,324
Other accrued expenses	610	808
Total Current Liabilities	3,282	3,397
Long-term lease liabilities	246	293
Total Liabilities	3,528	3,690
Contingencies (Note N)
Stockholders’ Equity
Common stock, $0.01 par value - 10,000,000 shares authorized; 5,383,300 shares issued and 5,272,204 shares outstanding at June 30, 2021, and 5,409,550 shares issued and 5,272,204 shares outstanding at December 31, 2020	53	53
Additional paid-in capital	45,574	45,477
Accumulated deficit	(5,176)	(5,185)
Treasury stock, 81,584 shares held in treasury at cost at June 30, 2021 and December 31, 2020	(580)	(580)
Total Stockholders' Equity	39,871	39,765
Total Liabilities and Stockholders' Equity	$ 43,399	$ 43,455