Note 14 - Subsequent Events (Detail) - Quarterly Financial Data (USD $)	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
Revenue	$ 5,491	$ 5,419	$ 5,546	$ 5,496	$ 5,544	$ 5,630	$ 5,846	$ 6,143	$ 21,952,460	$ 23,163,395
Gross margin	4,602	4,520	4,697	4,636	4,627	4,741	4,955	5,238	18,455,189	19,561,280
Noncash stock-based compensation	74	73	72	20	77	90	82	63	239,440	311,539
Total operating expenses	4,829	4,480	4,633	4,592	4,575	4,501	4,729	4,856	18,534,098	18,660,782
Income / (loss) from operations	(227)	40	64	44	52	240	226	382	(78,909)	900,498
Tax benefit	1,559				616				(1,559,000)	(616,000)
Net income	1,344	49	72	60	677	248	235	393	1,525,429	1,553,672
Unrealized gain / (loss) on available-for-sale investments	1	1	(1)	0	1	0	0	1	500	1,946
Comprehensive income	$ 1,345	$ 50	$ 71	$ 60	$ 678	$ 248	$ 235	$ 394	$ 1,525,929	$ 1,555,618
Basic net income per common share (in Dollars per share)	$ 0.16	$ 0.01	$ 0.01	$ 0.01	$ 0.08	$ 0.03	$ 0.03	$ 0.05	$ 0.18	$ 0.18
Diluted net income per common share (in Dollars per share)	$ 0.15	$ 0.01	$ 0.01	$ 0.01	$ 0.08	$ 0.03	$ 0.03	$ 0.05	$ 0.17	$ 0.18
Basic weighted average shares outstanding (in Shares)	8,527	8,524	8,520	8,505	8,493	8,477	8,468	8,435	8,519,058	8,468,375
Diluted weighted average shares outstanding (in Shares)	8,864	8,869	8,852	8,802	8,511	8,541	8,558	8,537	8,854,647	8,508,692