Condensed Consolidated Balance Sheets - USD ($)	Mar. 31, 2017	Dec. 31, 2016
Current Assets:
Cash and cash equivalents	$ 1,989,000	$ 2,778,000
Marketable securities	3,793,000	2,770,000
Accounts receivable, net of allowances of $29 and $31, respectively	3,186,000	3,504,000
Inventories, net	4,050,000	3,638,000
Prepaid expenses and other current assets	294,000	200,000
Total Current Assets	13,312,000	12,890,000
Property, Plant and Equipment:
Land	633,000	633,000
Buildings and improvements	3,966,000	3,966,000
Machinery and equipment	16,854,000	16,849,000
Gross property, plant and equipment	21,453,000	21,448,000
Less: accumulated depreciation	(18,904,000)	(18,737,000)
Net property, plant, and equipment	2,549,000	2,711,000
Intangible assets, net	609,000	628,000
Deferred income taxes, net	221,000	214,000
Other assets, net	204,000	203,000
Total Assets	16,895,000	16,646,000
Current Liabilities:
Accounts payable	1,511,000	1,525,000
Accrued compensation and commissions expense	1,002,000	942,000
Other accrued expenses	352,000	288,000
Total Current Liabilities	2,865,000	2,755,000
Commitments and Contingencies (Note L)
Stockholders’ Equity
Common stock, $0.01 par value - 10,000,000 shares authorized; 2,757,050 shares issued and 2,675,466 shares outstanding at March 31, 2017 and December 31, 2016	27,000	27,000
Additional paid-in capital	29,180,000	29,173,000
Accumulated deficit	(14,615,000)	(14,726,000)
Treasury stock, 81,584 shares held in treasury at cost at March 31, 2017 and December 31, 2016	(580,000)	(580,000)
Accumulated other comprehensive income (loss)	18,000	(3,000)
Total Stockholders' Equity	14,030,000	13,891,000
Total Liabilities and Stockholders' Equity	$ 16,895,000	$ 16,646,000