Note 13 - Supplementary Financial Data (Unaudited) (Details) - Supplementary Financial Data (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Supplementary Financial Data [Abstract]
Net revenue	$ 25,499	$ 18,726	$ 17,724	$ 16,189	$ 22,239	$ 16,828	$ 19,560	$ 15,967	$ 78,138	$ 74,594	$ 77,277
Cost of revenue	11,679	7,935	7,848	7,303	9,202	7,651	8,442	7,417	34,765	32,712	35,737
Gross profit	13,820	10,791	9,876	8,886	13,037	9,177	11,118	8,550	43,373	41,882	41,540
Sales and marketing	9,356	7,805	7,754	7,331	7,804	6,554	7,170	6,456	32,246	27,984	28,664
Research and development	2,649	2,628	2,622	2,644	2,438	2,440	2,217	2,121	10,543	9,216	8,427
General and administrative	3,407	2,897	2,335	2,564	3,135	2,160	2,354	2,289	11,203	9,938	11,276
Total operating expenses	15,412	13,330	12,711	12,539	13,377	11,154	11,741	10,866	53,922	47,138	48,367
Income (loss) from operations	(1,592)	(2,539)	(2,835)	(3,653)	(340)	(1,977)	(623)	(2,316)	(10,619)	(5,256)	(6,827)
Interest and other income, net	8		138	80	105	140	75	135
Income (loss) before income taxes	(1,584)	(2,539)	(2,697)	(3,573)	(235)	(1,837)	(548)	(2,181)	(10,393)	(4,801)	(6,330)
Income tax provision (benefit)	41	97	44	37	43	(169)	90	(18)	219	(54)	218
Net income (loss)	$ (1,625)	$ (2,636)	$ (2,741)	$ (3,610)	$ (278)	$ (1,668)	$ (638)	$ (2,163)	$ (10,612)	$ (4,747)	$ (6,548)
Net income (loss) per share—basic (in Dollars per share)	$ (0.11)	$ (0.18)	$ (0.19)	$ (0.26)	$ (0.02)	$ (0.11)	$ (0.04)	$ (0.15)
Net income (loss) per share—diluted (in Dollars per share)	$ (0.11)	$ (0.18)	$ (0.19)	$ (0.26)	$ (0.02)	$ (0.11)	$ (0.04)	$ (0.15)
Weighted average number of shares used in per share calculations:
Basic (in Shares)	14,425	14,334	14,231	14,021	14,016	14,541	14,723	14,408
Diluted (in Shares)	14,425	14,334	14,231	14,021	14,016	14,541	14,723	14,408