Note 13 - Stock-Based Compensation (Detail) (USD $)	12 Months Ended					12 Months Ended		12 Months Ended				1 Months Ended	6 Months Ended	12 Months Ended						0 Months Ended				12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Jul. 08, 2009	Mar. 31, 2006	Dec. 31, 2012 Consultant Compensation [Member] 2006 Stock Incentive Plan [Member]	Dec. 31, 2011 Consultant Compensation [Member] 2006 Stock Incentive Plan [Member]	Dec. 31, 2012 2012 Omnibus Incentive Plan [Member]	Jun. 30, 2012 2012 Omnibus Incentive Plan [Member]	Dec. 31, 2011 2012 Omnibus Incentive Plan [Member]	Jun. 30, 2012 Amended and Restated 2006 Stock Incentive Plan [Member]	Nov. 30, 2009 2006 Stock Incentive Plan [Member]	Nov. 30, 2011 2006 Stock Incentive Plan [Member]	Dec. 31, 2012 2006 Stock Incentive Plan [Member]		Dec. 31, 2008 2006 Stock Incentive Plan [Member]	Dec. 31, 2011 2006 Stock Incentive Plan [Member]		Jun. 27, 2007 2006 Stock Incentive Plan [Member]	Jul. 08, 2009 Non-Plan Option Activity [Member] CEO [Member]	Jul. 08, 2009 Non-Plan Option Activity [Member] CFO [Member]	Jul. 08, 2009 Non-Plan Option Activity [Member] CTO [Member]	Jul. 08, 2009 Non-Plan Option Activity [Member]	Dec. 31, 2012 Non-Plan Option Activity [Member]	Dec. 31, 2011 Non-Plan Option Activity [Member]
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized (in Dollars)	$ 6,300,000			$ 1,052,010
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition	2 years
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized					200,000				5,700,000		2,100,000								3,700,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant								7,494,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized												2,000,000	4,000,000			2,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number						135,531	138,864	187,375		0				8,452,340	[1]		9,168,893	[2]						443,038	443,038
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price (in Dollars per share)						$ 3.62	$ 3.58	$ 1.84		$ 0				$ 2.56	[1]		$ 2.70	[2]						$ 1.34	$ 1.34
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross						10,000		189,875						1,309,750	[3]									0
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in Dollars per share)						$ 4.20		$ 1.82						$ 3.69	[3]									$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period						13,333		2,500						1,124,982	[4]									0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price (in Dollars per share)						$ 3.60		$ 1.84						$ 5.93	[4]									$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number						91,352		70,919						5,819,245	[5]									443,038
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price (in Dollars per share)						$ 3.06		$ 2.68						$ 1.92	[5]									$ 1.34
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value (in Dollars)	$ 1,800,000	$ 4,900,000	$ 2,200,000
Share-based Compensation Arrangement by Share-based Payment Award, Options Exchanges, Authorized in Period, Gross																							5,751,937
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exchanges, Exercise Price (in Dollars per share)																							$ 1.00
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exchanges, Granted in Period																				2,268,466	1,826,971	732,500

[1] Includes 135,531 options granted to purchase common stock at a weighted average exercise price of $3.62 per share being held by consultants.

[2] Includes 138,864 outstanding options to purchase common stock at a weighted average exercise price of $3.58 per share being held by consultants.

[3] Includes 10,000 outstanding options to purchase common stock at a weighted average exercise price of $4.20 per share being held by consultants.

[4] Includes 13,333 of forfeited options to purchase common stock at a weighted average exercise price of $3.60 per share formerly held by consultants.

[5] Includes 91,352 exercisable options to purchase common stock at a weighted average exercise price of $3.06 per share being held by consultants.