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Note 15 - Equity Incentive Plans - Stock Options Outstanding (Details)
 12 Months Ended
Jun. 30, 2025
$ / shares
shares
Number of options outstanding (in shares) | shares 211,618
Weighted average exercise price, options outstanding (in dollars per share) $ 4.51
Weighted average remaining contractual life of options outstanding (Year) 8 years 3 months 18 days
Number of options exercisable (in shares) | shares 100,195
Weighted average exercise price, exercisable (in dollars per share) $ 7.44
Exercise Price Range One [Member]  
Upper Range Limit (in dollars per share) $ 1.69
Number of options outstanding (in shares) | shares 3,000
Weighted average exercise price, options outstanding (in dollars per share) $ 1.69
Weighted average remaining contractual life of options outstanding (Year) 9 years 7 months 6 days
Number of options exercisable (in shares) | shares 0
Weighted average exercise price, exercisable (in dollars per share) $ 0
Exercise Price Range Two [Member]  
Upper Range Limit (in dollars per share) $ 1.73
Number of options outstanding (in shares) | shares 87,453
Weighted average exercise price, options outstanding (in dollars per share) $ 1.73
Weighted average remaining contractual life of options outstanding (Year) 8 years
Number of options exercisable (in shares) | shares 59,901
Weighted average exercise price, exercisable (in dollars per share) $ 1.73
Exercise Price Range Three [Member]  
Upper Range Limit (in dollars per share) $ 1.84
Number of options outstanding (in shares) | shares 79,000
Weighted average exercise price, options outstanding (in dollars per share) $ 1.84
Weighted average remaining contractual life of options outstanding (Year) 9 years 4 months 24 days
Number of options exercisable (in shares) | shares 2,500
Weighted average exercise price, exercisable (in dollars per share) $ 1.84
Exercise Price Range Four [Member]  
Upper Range Limit (in dollars per share) $ 290
Number of options outstanding (in shares) | shares 42,165
Weighted average exercise price, options outstanding (in dollars per share) $ 15.49
Weighted average remaining contractual life of options outstanding (Year) 6 years 7 months 6 days
Number of options exercisable (in shares) | shares 37,794
Weighted average exercise price, exercisable (in dollars per share) $ 15.49
Lower Range Limit (in dollars per share) $ 2.53