Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current Assets:
Cash and cash equivalents	$ 15,508	$ 13,250
Marketable securities	3,775	3,803
Accounts receivable, net of allowances of $40 and $35, respectively	3,394	3,393
Inventories, net	4,466	3,875
Prepaid expenses and other current assets	242	229
Total Current Assets	27,385	24,550
Property, Plant and Equipment
Land	536	536
Buildings and improvements	4,029	3,973
Machinery and equipment	17,012	16,974
Gross property, plant and equipment	21,577	21,483
Less: accumulated depreciation	(19,491)	(19,304)
Net property, plant and equipment	2,086	2,179
Intangible assets, net	477	552
Deferred income taxes, net	127	173
Other assets		101
Total Assets	30,075	27,555
Current Liabilities:
Accounts payable	1,418	1,477
Accrued compensation and commissions expense	1,143	872
Other accrued expenses	191	278
Total Current Liabilities	2,752	2,627
Commitments and Contingencies (Note J)
Stockholders' Equity
Common stock, $0.01 par value - 10,000,000 shares authorized; 4,912,762 shares issued and 4,831,178 shares outstanding at December 31, 2018, and 4,774,477 shares issued and 4,692,893 shares outstanding at December 31, 2017	49	47
Additional paid-in capital	41,023	40,035
Accumulated deficit	(13,169)	(14,609)
Treasury stock, 81,584 shares held in treasury at cost at December 31, 2018 and 2017	(580)	(580)
Accumulated other comprehensive income		35
Total Stockholders' Equity	27,323	24,928
Total Liabilities and Stockholders' Equity	$ 30,075	$ 27,555