Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Current Assets:
Cash and cash equivalents	$ 18,331	$ 12,453
Marketable securities	5,791	5,631
Accounts receivable, net of allowances of $189 and $109, respectively	4,122	4,445
Inventories, net	5,280	6,016
Prepaid expenses and other current assets	257	365
Total Current Assets	33,781	28,910
Property, Plant and Equipment
Land	536	536
Buildings and improvements	4,810	4,651
Machinery and equipment	17,775	17,527
Gross property, plant and equipment	23,121	22,714
Less: accumulated depreciation	(20,336)	(19,883)
Net property, plant and equipment	2,785	2,831
Right-of-use lease asset	422	331
Equity investment in unconsolidated subsidiary	3,072	3,334
Intangible assets, net	327	402
Deferred income taxes, net	3,052	3,307
Other assets	16	102
Total Assets	43,455	39,217
Current Liabilities:
Accounts payable	1,265	1,865
Accrued compensation and commissions expense	1,324	1,832
Other accrued expenses	808	387
Total Current Liabilities	3,397	4,084
Long-term lease liability	293	240
Total Liabilities	3,690	4,324
Contingencies (Note N)
Stockholders' Equity
Common stock, $0.01 par value - 10,000,000 shares authorized; 5,409,550 shares issued and 5,272,204 shares outstanding at December 31, 2020, and 5,014,647 shares issued and 4,933,063 shares outstanding at December 31, 2019	53	50
Additional paid-in capital	45,477	41,576
Accumulated deficit	(5,185)	(6,153)
Treasury stock, 81,584 shares held in treasury at cost at December 31, 2020 and 2019	(580)	(580)
Total Stockholders' Equity	39,765	34,893
Total Liabilities and Stockholders' Equity	$ 43,455	$ 39,217