Note 13 - Warrants (Details) - Summary of Warrant Activity (USD $)	6 Months Ended
	Jun. 30, 2014	Jan. 15, 2014	Feb. 26, 2013
Note 13 - Warrants (Details) - Summary of Warrant Activity [Line Items]
Warrants outstanding at December 31, 2013	3,268,013
Warrants outstanding at December 31, 2013	$ 10.43	$ 4.10	$ 5.31
Warrants outstanding at June 30, 2014	5,069,815
Warrants outstanding at June 30, 2014	$ 8.18	$ 4.10	$ 5.31
Weighted average remaining contractual terms (in years)	2 years 328 days
Hercules Credit Agreement [Member]
Note 13 - 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 11	1,801,802
Warrants granted in connection with the January 2014 Common Stock Offering, as more fully described in Note 11	$ 4.10