Note 13 - Warrants (Details) - Summary of Warrant Activity (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Oct. 30, 2014
Note 13 - Warrants (Details) - Summary of Warrant Activity [Line Items]
Warrants outstanding	3,170,520	1,747,478	2,583,778	3,100,000
Warrants outstanding	$ 10.65	$ 15.17	$ 1,418
Weighted average remaining contractual terms (years)	2 years 146 days
Warrant Issued	1,801,802	1,341,382
Warrant Issued	$ 4.10	$ 5.31
Warrants exercised for common stock		(15,833)	(847,715)
Warrants exercised for common stock		$ 14.63	$ 12.11
Warrants outstanding	5,069,815	3,170,520	1,747,478	3,100,000
Warrants outstanding	$ 8.18	$ 10.65	$ 15.17
Oxford & Horizon Warrant [Member]
Note 13 - Warrants (Details) - Summary of Warrant Activity [Line Items]
Warrant Issued			11,415
Warrant Issued			$ 13.14
Hercules Warrant [Member]
Note 13 - Warrants (Details) - Summary of Warrant Activity [Line Items]
Warrant Issued	97,493	97,493
Warrant Issued	$ 3.59	$ 3.59