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Note 15 - Equity Incentive Plans - Restricted Stock Activity (Details) - Restricted Stock [Member]
 12 Months Ended
Jun. 30, 2025
$ / shares
shares
Unvested, shares (in shares) | shares 24,105
Unvested, weighted average grant date fair value (in dollars per share) | $ / shares $ 100.34
Granted, shares (in shares) | shares 20,000
Granted, weighted average grant date fair value (in dollars per share) | $ / shares $ 1.79
Vested, shares (in shares) | shares (11,193)
Vested, weighted average grant date fair value (in dollars per share) | $ / shares $ 14.02
Unvested, shares (in shares) | shares 32,912
Unvested, weighted average grant date fair value (in dollars per share) | $ / shares $ 69.81