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Note 5 - Stockholders' Equity - Schedule of Warrant Activity (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
9 Months Ended 12 Months Ended
Mar. 31, 2024
Jun. 30, 2023
Outstanding (in shares) 80  
Outstanding, Weighted Average Exercise Price (in dollars per share) $ 72.1  
Outstanding, Aggregate Fair Market Value $ 3,747 $ 3,747
Outstanding, Weighted Average Remaining Contractual Term (Year) 1 year 10 months 6 days 2 years 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) 0  
Warrants expired,Weighted Average Exercise Price (in dollars per share) $ 0  
Warrants expired, Aggregate Fair Market Value $ 0  
Outstanding (in shares) 80 80
Outstanding, Weighted Average Exercise Price (in dollars per share) $ 72.1 $ 72.1
Outstanding, Weighted Average Exercise Price (in dollars per share) $ 72.1 $ 72.1
Outstanding (in shares) 80 80
Class of Warrant or Rights, Warrants Issued March 26, 2020 [Member]    
Outstanding (in shares) 1  
Outstanding (in shares) 1 1
Outstanding, Weighted Average Exercise Price (in dollars per share) $ 187.5  
Outstanding, Weighted Average Exercise Price (in dollars per share) $ 187.5  
Class Of Warrant Or Right, Expiration Date Mar. 25, 2025  
Outstanding (in shares) 1 1
Class of Warrant or Rights, Warrants Issued March 30, 2020 [Member]    
Outstanding (in shares) 2  
Outstanding (in shares) 2 2
Outstanding, Weighted Average Exercise Price (in dollars per share) $ 140.63  
Outstanding, Weighted Average Exercise Price (in dollars per share) $ 140.63  
Class Of Warrant Or Right, Expiration Date Mar. 27, 2025  
Outstanding (in shares) 2 2
Class of Warrant or Rights, Warrants Issued October 23, 2020 [Member]    
Outstanding (in shares) 15  
Outstanding (in shares) 15 15
Outstanding, Weighted Average Exercise Price (in dollars per share) $ 86.25  
Outstanding, Weighted Average Exercise Price (in dollars per share) $ 86.25  
Class Of Warrant Or Right, Expiration Date Oct. 21, 2025  
Outstanding (in shares) 15 15
Class of Warrant or Rights, Warrants Issued October 28, 2020 [Member]    
Outstanding (in shares) 6  
Outstanding (in shares) 6 6
Outstanding, Weighted Average Exercise Price (in dollars per share) $ 80.63  
Outstanding, Weighted Average Exercise Price (in dollars per share) $ 80.63  
Class Of Warrant Or Right, Expiration Date Oct. 28, 2025  
Outstanding (in shares) 6 6
Class of Warrant or Rights, Warrants Issued February 16, 2021 [Member]    
Outstanding (in shares) 6  
Outstanding (in shares) 6 6
Outstanding, Weighted Average Exercise Price (in dollars per share) $ 121.88  
Outstanding, Weighted Average Exercise Price (in dollars per share) $ 121.88  
Class Of Warrant Or Right, Expiration Date Feb. 11, 2026  
Outstanding (in shares) 6 6
Class of Warrant or Rights, Warrants Issued April 12, 2021 [Member]    
Outstanding (in shares) 50  
Outstanding (in shares) 50 50
Outstanding, Weighted Average Exercise Price (in dollars per share) $ 56.25  
Outstanding, Weighted Average Exercise Price (in dollars per share) $ 56.25  
Class Of Warrant Or Right, Expiration Date Apr. 07, 2026  
Outstanding (in shares) 50 50