Statements of Operations (Unaudited) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Statements of Operations [Abstract]
Revenues	$ 2,531,000	$ 2,054,000	$ 5,476,000	$ 2,983,000
Cost of revenues	1,948,000	1,764,000	4,674,000	2,610,000
Gross income	583,000	290,000	802,000	373,000
Operating expenses
Research and development	441,000	361,000	1,004,000	683,000
Selling, general & administrative	1,414,000	1,551,000	2,862,000	3,028,000
Total operating expenses	1,855,000	1,912,000	3,866,000	3,711,000
Operating loss	(1,272,000)	(1,622,000)	(3,064,000)	(3,338,000)
Other income and (expense)
Interest and other income (expense)	(78,000)	(2,000)	(93,000)	(5,000)
Total other income and (expense)	(78,000)	(2,000)	(93,000)	(5,000)
Net loss	$ (1,350,000)	$ (1,624,000)	$ (3,157,000)	$ (3,343,000)
Basic and diluted loss per share	$ (0.04)	$ (0.05)	$ (0.10)	$ (0.11)
Weighted average number of common shares outstanding	31,513,000	31,416,000	31,497,000	31,410,000