Note 11 - Warrants (Details) - Summary of Warrant Activity (USD $)	3 Months Ended
	Mar. 31, 2014	Jan. 15, 2014	Feb. 26, 2013
Note 11 - Warrants (Details) - Summary of Warrant Activity [Line Items]
Warrants outstanding at December 31, 2013	3,268,013
Warrants outstanding at December 31, 2013 (in Dollars per Item)	10.43	4.10	5.31
Warrants outstanding at March 31, 2014	5,069,815
Warrants outstanding at March 31, 2014 (in Dollars per Item)	8.18	4.10	5.31
Weighted average remaining contractual terms (in years)	3 years 47 days
Hercules Credit Agreement [Member]
Note 11 - Warrants (Details) - Summary of Warrant Activity [Line Items]
Warrants granted in connection with the January 2014 Common Stock Offering, as more fully described in Note 9	1,801,802
Warrants granted in connection with the January 2014 Common Stock Offering, as more fully described in Note 9 (in Dollars per share)	$ 4.10