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Note 2 - Summary of Significant Accounting Policies - Securities Excluded from Calculation of Earnings Per Share (Details) - shares
12 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Securites excluded (in shares) 14,375,203 6,249,554
Liability Warrants [Member]    
Securites excluded (in shares) 3,821,115 3,821,115
Equity Warrants [Member]    
Securites excluded (in shares) 15,571 18,114
Liability Pre-Funded Warrants [Member]    
Securites excluded (in shares) 10,293,983 2,236,651
Share-Based Payment Arrangement, Option [Member]    
Securites excluded (in shares) 211,618 146,539
Restricted Stock [Member]    
Securites excluded (in shares) 32,916 25,360
Restricted Stock Units (RSUs) [Member]    
Securites excluded (in shares) 0 1,775