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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, 2018
Jun. 30, 2017
Net loss $ 6,188,810 $ 2,836,453
Weighted average shares outstanding, basic and diluted (in shares) 5,675,366 4,608,177
Net loss attributable to common stock, basic and diluted, loss per share (in dollars per share) $ 1.09 $ 0.62