Condensed Consolidated Balance Sheets-Unaudited (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Current Assets:
Cash and cash equivalents	$ 7,824	$ 8,625
Restricted cash (Note D)	1,500	1,500
Accounts receivable, less allowances of $57 and $79, respectively	4,479	4,350
Inventories, net (Note C)	5,460	5,349
Deferred income taxes	1,114	1,114
Prepaid expenses and other current assets	541	665
Total Current Assets	20,918	21,603
Property, Plant and Equipment
Land	640	640
Buildings and improvements	3,793	3,785
Machinery and equipment	15,787	15,655
Gross property, plant and equipment	20,220	20,080
Less: accumulated depreciation	(15,590)	(15,373)
Net property, plant, and equipment	4,630	4,707
Deferred income taxes, net	3,021	2,808
Other assets, net	367	475
Total Assets	28,936	29,593
Current Liabilities:
Note payable to bank (Note D)	1,382	1,249
Accounts payable	1,737	2,452
Accrued compensation and commissions expense	944	1,011
Other accrued expenses	226	209
Current maturities of long-term debt (Note D)	0	58
Total Current Liabilities	4,289	4,979
Long-term debt, net of current portion (Note D)	0	0
Total Liabilities	4,289	4,979
Stockholders' Equity:
Common stock, $0.01 par value - 10,000,000 shares authorized; 2,656,173 shares issued and 2,605,730 shares outstanding at March 31, 2013, and 2,648,059 shares issued and 2,597,605 shares outstanding at December 31, 2012	26	26
Additional paid-in capital	28,194	28,084
Accumulated deficit	(3,202)	(3,119)
Treasury stock: 50,443 and 50,454 shares held in treasury at cost at March 31, 2013 and December 31, 2012, respectively	(405)	(405)
Accumulated other comprehensive income	34	28
Total Stockholders' Equity	24,647	24,614
Total Liabilities and Stockholders' Equity	$ 28,936	$ 29,593