Note 11 - Warrants (Detail) - Summary of Warrant Activity (USD $)	1 Months Ended	3 Months Ended
	Sep. 30, 2009	Mar. 31, 2013	Feb. 26, 2013
Warrants outstanding at December 31, 2012		7,863,653
Warrants outstanding at December 31, 2012 (in Dollars per Item)		3.37	1.18
Warrants exercised for common stock		(71,250)
Warrants exercised for common stock (in Dollars per share)		$ 3.25
Warrants outstanding at March 31, 2013		13,828,622
Warrants outstanding at March 31, 2013 (in Dollars per Item)		2.42	1.18
Weighted average remaining contractual terms (years)	66 months	4 years 83 days
Warrant [Member]
Warrants granted in connection with the Preferred Stock Offering as more fully described in Note 9		6,036,219
Warrants granted in connection with the Preferred Stock Offering as more fully described in Note 9 (in Dollars per share)		$ 1.18