SELECTED QUARTERLY INFORMATION (UNAUDITED) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended																12 Months Ended
	Dec. 31, 2012		Sep. 30, 2012		Jun. 30, 2012		Mar. 31, 2012		Dec. 31, 2011		Sep. 30, 2011		Jun. 30, 2011		Mar. 31, 2011		Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Unaudited quarterly data [Abstract]
Total revenue	$ 6,827		$ 6,671		$ 7,440		$ 6,733		$ 6,158		$ 6,256		$ 6,841		$ 6,156		$ 27,671	$ 25,411	$ 24,230
Gross profit	2,787		2,894		2,856		2,796		2,647		2,606		3,045		2,433		11,333	10,731	9,988
Net income (loss)	$ 285		$ (7)		$ 152		$ 187		$ (875)	[1]	$ 63	[1]	$ 429	[1]	$ 492	[1]	$ 617	$ 109	$ (1,535)
Diluted earnings (loss) per share (in dollars per share)	$ 0.02	[2]	$ 0	[2]	$ 0.01	[2]	$ 0.01	[2]	$ (0.05)	[2]	$ 0.00	[2]	$ 0.02	[2]	$ 0.03	[2]	$ 0.03	$ 0.01	$ (0.09)

[1] Fourth quarter loss was mainly the result of recognizing a legal settlement loss.

[2] Quarterly income (loss) per share may not equal the annual reported amounts due to period roundings.