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Note 8 - Stock Options - Outstanding Common Stock Purchase Options (Details) - $ / shares
3 Months Ended
Sep. 30, 2017
Jun. 30, 2017
Jun. 30, 2016
Exercise Price (in dollars per share) $ 0.10 $ 0.11 $ 0.18
Outstanding Balance (in shares) 41,800,000 44,470,000 41,965,000
Stock Option 1 [Member]      
Grant Date Feb. 27, 2013    
Expiration Date Feb. 27, 2018    
Exercise Price (in dollars per share) $ 0.21    
Outstanding Balance (in shares) 3,075,000 3,725,000  
Stock Option 2 [Member]      
Grant Date Jul. 09, 2013    
Expiration Date Jul. 09, 2018    
Exercise Price (in dollars per share) $ 0.11    
Outstanding Balance (in shares) 730,000 880,000  
Stock Option 3 [Member]      
Grant Date Sep. 19, 2013    
Expiration Date Jul. 19, 2018    
Exercise Price (in dollars per share) $ 0.15    
Outstanding Balance (in shares) 375,000 450,000  
Stock Option 4 [Member]      
Grant Date Jan. 10, 2014    
Expiration Date Jan. 10, 2019    
Exercise Price (in dollars per share) $ 0.18    
Outstanding Balance (in shares) 3,050,000 3,775,000  
Stock Option 5 [Member]      
Grant Date Jul. 03, 2014    
Expiration Date Jul. 03, 2019    
Exercise Price (in dollars per share) $ 0.15    
Outstanding Balance (in shares) 2,250,000 2,750,000  
Stock Option 6 [Member]      
Grant Date Feb. 26, 2015    
Expiration Date Feb. 26, 2020    
Exercise Price (in dollars per share) $ 0.20    
Outstanding Balance (in shares) 3,530,000 4,100,000  
Stock Option 7 [Member]      
Grant Date Dec. 22, 2015    
Expiration Date Dec. 22, 2020    
Exercise Price (in dollars per share) $ 0.06    
Outstanding Balance (in shares) 7,650,000 7,650,000  
Stock Option 8 [Member]      
Grant Date Jun. 09, 2017    
Expiration Date Jun. 09, 2022    
Exercise Price (in dollars per share) $ 0.07    
Outstanding Balance (in shares) 21,140,000 21,140,000