Note 11 - Stock-Based Compensation (Detail) (USD $)	3 Months Ended			3 Months Ended		3 Months Ended				1 Months Ended	3 Months Ended		6 Months Ended	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2006	Mar. 31, 2013 Consultant Compensation [Member] 2006 Stock Incentive Plan [Member]	Dec. 31, 2012 Consultant Compensation [Member] 2006 Stock Incentive Plan [Member]	Mar. 31, 2013 2012 Omnibus Incentive Plan [Member]	Dec. 31, 2012 2012 Omnibus Incentive Plan [Member]	Jun. 30, 2012 2012 Omnibus Incentive Plan [Member]	Jun. 30, 2012 Amended and Restated 2006 Stock Incentive Plan [Member]	Nov. 30, 2009 2006 Stock Incentive Plan [Member]	Mar. 31, 2013 2006 Stock Incentive Plan [Member]		Nov. 30, 2011 2006 Stock Incentive Plan [Member]	Dec. 31, 2008 2006 Stock Incentive Plan [Member]	Dec. 31, 2012 2006 Stock Incentive Plan [Member]		Jun. 27, 2007 2006 Stock Incentive Plan [Member]
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized (in Dollars)	$ 4,800,000
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						7,600,000
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				115,531	135,531	192,375	187,375				8,208,767	[1]			8,452,340	[2]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price (in Dollars per share)				$ 4.08	$ 3.62	$ 2.86	$ 2.86				$ 2.53	[1]			$ 2.56	[2]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period				20,000		0					79,185	[3]
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price (in Dollars per share)				$ 1.00		$ 0					$ 1.00	[3]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number				71,352		103,294					5,959,042	[4]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price (in Dollars per share)				$ 3.64		$ 2.87					$ 1.99	[4]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value (in Dollars)	$ 116,000	$ 192,000

[1] Includes 115,531 options granted to purchase common stock at a weighted average exercise price of $4.08 per share being held by consultants.

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

[3] Includes 20,000 outstanding options to purchase common stock at a weighted average exercise price of $1.00 per share being held by consultants.

[4] Includes 71,352 exercisable options to purchase common stock at a weighted average exercise price of $3.64 per share being held by consultants.