QUARTERLY FINANCIAL INFORMATION (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
Notes to Financial Statements
Total revenue	$ 18,453	$ 16,906	$ 18,271	$ 19,175	$ 15,505	$ 17,608	$ 17,447	$ 19,505	$ 72,805	$ 70,065	$ 65,451
Gross profit	7,404	6,726	8,048	8,923	6,593	6,827	7,469	8,298	31,101	29,187	24,792
Operating income	720	(27)	383	1,082	414	408	887	1,540	2,158	3,249	358
Net income	$ 389	$ (32)	$ 262	$ 584	$ 484	$ 288	$ 457	$ 916	$ 1,203	$ 2,145
Net income per share basic	$ 0.07	$ (0.01)	$ 0.05	$ 0.11	$ 0.09	$ 0.06	$ 0.09	$ 0.18	$ 0.23	$ 0.41	$ 0.00
Net income per share diluted	$ 0.07	$ (0.01)	$ 0.05	$ 0.11	$ 0.09	$ 0.05	$ 0.09	$ 0.17	$ 0.22	$ 0.40	$ 0.00