Statements of Operations (Unaudited) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Statements of Operations [Abstract]
Revenues	$ 508,000	$ 1,904,000	$ 5,984,000	$ 4,887,000
Cost of revenues	434,000	1,615,000	5,108,000	4,225,000
Gross income	74,000	289,000	876,000	662,000
Operating expenses
Research and development	528,000	483,000	1,532,000	1,166,000
Selling, general & administrative	1,172,000	1,520,000	4,034,000	4,548,000
Total operating expenses	1,700,000	2,003,000	5,566,000	5,714,000
Operating loss	(1,626,000)	(1,714,000)	(4,690,000)	(5,052,000)
Other income and (expense)
Interest and other income (expense)	(20,000)	(36,000)	(113,000)	(41,000)
Total other income and (expense)	(20,000)	(36,000)	(113,000)	(41,000)
Net loss	$ (1,646,000)	$ (1,750,000)	$ (4,803,000)	$ (5,093,000)
Basic and diluted loss per share	$ (0.05)	$ (0.06)	$ (0.15)	$ (0.16)
Weighted average number of common shares outstanding	31,515,000	31,430,000	31,503,000	31,417,000