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Note 12 - Net Loss Per Share (Details Textual) - $ / shares
12 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Share-Based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit (in dollars per share) $ 0.64 $ 1.85
Share-based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit (in dollars per share) $ 6.00 $ 7.50
Restricted Stock [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) 0 0
Share-Based Payment Arrangement, Option [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) 1,028,532 275,503