Note 7 - Recapitalization - Preferred Stock Exchanged for Cash and Common Stock (Details)	6 Months Ended
	Jun. 30, 2016 $ / shares shares
Convertible Preferred Stock [Member]
Convertible Preferred (in dollars per share) | $ / shares	$ 0.165
Convertible Preferred (in shares) | shares	1.95
Series B Preferred Stock [Member]
Convertible Preferred (in dollars per share) | $ / shares	$ 0.0825
Convertible Preferred (in shares) | shares	2.43
Series C Preferred Stock [Member]
Convertible Preferred (in dollars per share) | $ / shares	$ 2.708
Convertible Preferred (in shares) | shares	31.27
Series D Preferred Stock [Member]
Convertible Preferred (in dollars per share) | $ / shares	$ 0.36232
Convertible Preferred (in shares) | shares	5.072464