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Note 6 - Stockholders' Equity - Warrant Activity (Details) - $ / shares
 3 Months Ended 12 Months Ended
Sep. 30, 2016
Jun. 30, 2016
Minimum [Member]    
Warrants outstanding and exercisable at June 30, 2016 105 days 142 days
Maximum [Member]    
Warrants outstanding and exercisable at June 30, 2016 2 years 83 days 2 years 182 days
Warrants outstanding and exercisable at June 30, 2016 (in shares) 28,040,096  
Warrants outstanding and exercisable at June 30, 2016 (in dollars per share) $ 0.20  
Warrants exchanged (in shares) (1,837,777)  
Warrants exchanged (in dollars per share) $ 0.14  
Warrants exchanged 105 days  
Warrants outstanding and exercisable at September 30, 2016 (in shares) 26,202,319 28,040,096
Warrants outstanding and exercisable at September 30, 2016 (in dollars per share) $ 0.20 $ 0.20