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Note 5 - Loss Per Share - Reconciliation of the Components of Basic and Diluted Net Loss Per Share (Details) - USD ($)
 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Net income/(loss) $ 23,869,123 $ (9,240,041)
Weighted average shares for basic EPS (in shares) 6,250,894 6,475,795
Effect of dilutive securities (in shares) 2,767
Weighted average shares for diluted EPS (in shares) 6,253,661 6,475,795
Basic (in dollars per share) $ 3.82 $ (1.43)
Diluted (in dollars per share) $ 3.82 $ (1.43)