Note 6 - Warrant Activity (Details) - Warrants [Member] - $ / shares	12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Beginning balance (in shares)	5,113,420	1,125,000
Beginning balance (in dollars per share)	$ 2.21	$ 2.64
Warrants granted (in shares)	0	3,988,420
Warrants granted (in dollars per share)	$ 0	$ 2.09
Warrants expired (in shares)	(61,020)
Warrants expired (in dollars per share)	$ 2.15
Outstanding at June 30 (in shares)	5,052,400	5,113,420
Outstanding at June 30 (in dollars per share)	$ 2.21	$ 2.21
Exercisable at June 30 (in shares)	5,052,400	3,445,020
Exercisable at June 30 (in dollars per share)	$ 2.21	$ 1.92