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Note 7 - Stockholders' Equity - Schedule of Warrant Activity (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 9 Months Ended 12 Months Ended
Mar. 31, 2025
Jun. 30, 2024
Outstanding (in shares) 80  
Warrants Outstanding, Weighted Average Exercise Price (in dollars per share) $ 72.1  
Outstanding, Aggregate Fair Market Value $ 3,553 $ 3,747
Outstanding, Weighted Average Remaining Contractual Term (Year) 10 months 17 days 1 year 7 months 6 days
Warrants issued (in shares) 0  
Warrants issued, Weighted Average Exercise Price (in dollars per share) $ 0  
Warrants issued, Aggregate Fair Market Value $ 0  
Warrants exercised (in shares) 0  
Warrants exercised, Weighted Average Exercise Price (in dollars per share) $ 0  
Warrants exercised, Aggregate Fair Market Value $ 0  
Warrants expired (in shares) (3)  
Warrants expired,Weighted Average Exercise Price (in dollars per share) $ 154.13  
Warrants expired, Aggregate Fair Market Value $ (194)  
Outstanding (in shares) 77 80
Warrants Outstanding, Weighted Average Exercise Price (in dollars per share) $ 69.04 $ 72.1