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Note 10 - Stockholders' Equity - Warrant Activity (Details) - $ / shares
12 Months Ended
Jun. 30, 2021
Jun. 30, 2019
Balance (in shares) 6,080,000 250,000
Balance (in dollars per share) [1] $ 0.75 $ 0.54
Warrants issued (in shares) 9,134,615 5,830,000
Warrants issued (in dollars per share) [1] $ 0.57 $ 0.76
Warrants exercised (in shares) (12,318,877)  
Warrants exercised (in dollars per share) [1] $ 0.63  
Warrants expired (in shares) (250,000)  
Warrants expired (in dollars per share) [1] $ 0.54  
Balance (in shares) 2,645,738 6,080,000
Balance (in dollars per share) [1] $ 0.70 $ 0.75
[1] Weighted average exercise price per share.