Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Current Assets:
Cash and cash equivalents	$ 13,250	$ 2,778
Marketable securities	3,803	2,770
Accounts receivable, net of allowances of $35 and $31, respectively	3,393	3,504
Inventories, net	3,875	3,638
Prepaid expenses and other current assets	229	200
Total Current Assets	24,550	12,890
Property, Plant and Equipment
Land	536	633
Buildings and improvements	3,973	3,966
Machinery and equipment	16,974	16,849
Gross property, plant and equipment	21,483	21,448
Less: accumulated depreciation	(19,304)	(18,737)
Net property, plant and equipment	2,179	2,711
Intangible assets, net	552	628
Deferred income taxes, net	173	214
Other assets	101	203
Total Assets	27,555	16,646
Current Liabilities:
Accounts payable	1,477	1,525
Accrued compensation and commissions expense	872	942
Other accrued expenses	278	288
Total Current Liabilities	2,627	2,755
Commitments and Contingencies (Note K)
Stockholders' Equity
Common stock, $0.01 par value - 10,000,000 shares authorized; 4,774,477 shares issued and 4,692,893 shares outstanding at December 31, 2017, and 2,757,050 shares issued and 2,675,466 shares outstanding at December 31, 2016	47	27
Additional paid-in capital	40,035	29,173
Accumulated deficit	(14,609)	(14,726)
Treasury stock, 81,584 shares held in treasury at cost at December 31, 2017 and 2016	(580)	(580)
Accumulated other comprehensive income (loss)	35	(3)
Total Stockholders' Equity	24,928	13,891
Total Liabilities and Stockholders' Equity	$ 27,555	$ 16,646