Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Current Assets:
Cash and cash equivalents	$ 10,298	$ 15,508
Marketable securities	8,852	3,775
Accounts receivable, net of allowances of $32 and $40, respectively	4,399	3,394
Inventories, net	5,173	4,466
Prepaid expenses and other current assets	295	242
Total Current Assets	29,017	27,385
Property, plant and equipment:
Land	536	536
Buildings and improvements	4,315	4,029
Machinery and equipment	17,129	17,012
Gross property, plant and equipment	21,980	21,577
Less: accumulated depreciation	(19,592)	(19,491)
Net property, plant, and equipment	2,388	2,086
Intangible assets, net	458	477
Deferred income taxes, net	114	127
Other assets, net	142
Total Assets	32,119	30,075
Current Liabilities:
Accounts payable	2,428	1,418
Accrued compensation and commissions	1,280	1,143
Other accrued expenses	429	191
Total Current Liabilities	4,137	2,752
Commitments and Contingencies (Note L)
Stockholders’ Equity
Common stock, $0.01 par value - 10,000,000 shares authorized; 4,927,012 shares issued and 4,845,428 shares outstanding at March 31, 2019, and 4,912,762 shares issued and 4,831,178 shares outstanding at December 31, 2018	49	49
Additional paid-in capital	41,100	41,023
Accumulated deficit	(12,587)	(13,169)
Treasury stock, 81,584 shares held in treasury at cost at March 31, 2019 and December 31, 2018	(580)	(580)
Total Stockholders' Equity	27,982	27,323
Total Liabilities and Stockholders' Equity	$ 32,119	$ 30,075