Note 5 - Warrant Activity (Details) - Warrants [Member]	9 Months Ended
	Mar. 31, 2016 $ / shares shares
Beginning balance (in shares) | shares	252,620
Beginning balance (in dollars per share) | $ / shares	$ 44.18
Warrants granted (in shares) | shares	5,238,971
Warrants granted (in dollars per share) | $ / shares	$ 9.83
Warrants canceled (in shares) | shares	(611,156)
Warrants canceled (in dollars per share) | $ / shares	$ 17.21
Warrants exercised (in shares) | shares	(51,712)
Warrants exercised (in dollars per share) | $ / shares	$ 13.60
Ending balance (in shares) | shares	4,828,723
Ending balance (in dollars per share) | $ / shares	$ 9.37
Warrants exercisable at, (in shares) | shares	600,782
Warrants exercisable at, (in dollars per share) | $ / shares	$ 19.02