Note 8 - Warrant Activity (Details) - Restricted Stock [Member] - $ / shares	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Beginning balance (in shares)	252,620	255,671
Beginning balance (in dollars per share)	$ 44.18	$ 44.18
Warrants granted (in shares)	5,238,971
Warrants granted (in dollars per share)	$ 9.83
Warrants exercised (cashless) (in shares)	(51,712)
Warrants exercised (cashless) (in dollars per share)	$ 13.60
Warrants expired/canceled (in shares)	(611,156)	(3,051)
Warrants expired/canceled (in dollars per share)	$ 17.21	$ 43
Outstanding at June 30 (in shares)	4,828,723	252,620
Outstanding at June 30 (in dollars per share)	$ 9.37	$ 44.18
Exercisable at June 30 (in shares)	600,782	252,620
Exercisable at June 30 (in dollars per share)	$ 19.02	$ 44.18