Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Current Assets:
Cash and cash equivalents	$ 16,631	$ 12,453
Marketable securities	5,306	5,631
Accounts receivable, net of allowances of $105 and $109, respectively	4,819	4,445
Inventories, net	5,986	6,016
Prepaid expenses and other current assets	341	365
Total Current Assets	33,083	28,910
Property, plant and equipment:
Land	536	536
Buildings and improvements	4,651	4,651
Machinery and equipment	17,583	17,527
Gross property, plant and equipment	22,770	22,714
Less: accumulated depreciation	(19,999)	(19,883)
Net property, plant, and equipment	2,771	2,831
Equity investment in unconsoldiated subsidiary	3,295	3,334
Deferred income taxes, net	3,248	3,307
Intangible assets, net	383	402
Right-of-use lease asset	318	331
Other assets		102
Total Assets	43,098	39,217
Current Liabilities:
Accounts payable	1,639	1,865
Accrued compensation and commissions	2,224	1,832
Other accrued expenses	837	627
Total Current Liabilities	4,700	4,324
Commitments and Contingencies (Note N)
Stockholders’ Equity
Common stock, $0.01 par value - 10,000,000 shares authorized; 5,337,372 shares issued and 5,210,788 shares outstanding at March 31, 2020, and 5,014,647 shares issued and 4,933,063 shares outstanding at December 31, 2019	53	50
Additional paid-in capital	44,895	41,576
Accumulated deficit	(5,970)	(6,153)
Treasury stock, 81,584 shares held in treasury at cost at March 31, 2020 and December 31, 2019	(580)	(580)
Total Stockholders' Equity	38,398	34,893
Total Liabilities and Stockholders' Equity	$ 43,098	$ 39,217