Note 13 - Changes in Derivative Warrants' Fair Value (Details)	12 Months Ended
	Dec. 31, 2015 USD ($)
July 30, 2014 Warrants [Member]
Warrant derivative liability as of December 31, 2014	$ 1,410,000
Fair value of outstanding warrants issued on August 12, 2015
Change in fair value of warrants through December 8, 2015	$ (1,100,000)
Reclassification of warrant liability to equity on December 8, 2015	(310,000)
Reclassification of warrant liability to equity on December 8, 2015	$ 310,000
Warrant derivative liability as of December 31, 2015
December 4, 2014 Warrants [Member]
Warrant derivative liability as of December 31, 2014	$ 1,790,000
Fair value of outstanding warrants issued on August 12, 2015
Change in fair value of warrants through December 8, 2015	$ (1,414,000)
Reclassification of warrant liability to equity on December 8, 2015	(376,000)
Reclassification of warrant liability to equity on December 8, 2015	$ 376,000
Warrant derivative liability as of December 31, 2015
August 12, 2015 Warrants [Member]
Warrant derivative liability as of December 31, 2014
Fair value of outstanding warrants issued on August 12, 2015	$ 347,000
Change in fair value of warrants through December 8, 2015	(221,000)
Reclassification of warrant liability to equity on December 8, 2015	(126,000)
Reclassification of warrant liability to equity on December 8, 2015	$ 126,000
Warrant derivative liability as of December 31, 2015
Warrant derivative liability as of December 31, 2014	$ 3,200,000
Fair value of outstanding warrants issued on August 12, 2015	347,000
Change in fair value of warrants through December 8, 2015	(2,735,000)
Reclassification of warrant liability to equity on December 8, 2015	812,000
Reclassification of warrant liability to equity on December 8, 2015	$ (812,000)
Warrant derivative liability as of December 31, 2015