Note 11 - Warrants (Detail) - Summary of All Warrant Activity (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Jun. 30, 2012	Sep. 30, 2009
Warrants outstanding at January 1, 2010	11,627,001	1,009,076	1,009,076
Warrants outstanding at January 1, 2010 (in Dollars per Item)	3.15	5.24	5.24		5.24
Warrants exercised for common stock	(3,804,868)	(156,866)	0	(51,370)
Warrants exercised for common stock weighted average exercise price (in Dollars per share)	$ 2.69	$ 2.73	$ 0
Number of Warrants Issued		10,774,791	0
Weighted Average Exercise Price (in Dollars per share)			$ 0
Number of Warrants Issued	7,873,503	11,627,001	1,009,076
Weighted Average Exercise Price (in Dollars per Item)	3.37	3.15	5.24		5.24
Aggregate intrinsic value of outstanding warrants at December 31, 2012 (in Dollars per share)	$ 37,947,651
Weighted average remaining contractual terms (years)	3 years 343 days
Issued in Connection with 2011 Equity Transactions (Member)
Number of Warrants Issued		10,774,791
Weighted Average Exercise Price (in Dollars per share)		$ 2.95
Credit Agreement [Member]
Number of Warrants Issued	51,370
Weighted Average Exercise Price (in Dollars per share)	$ 2.92