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Note 6 - Stockholders' Equity (Tables)
3 Months Ended
Sep. 30, 2024
Notes Tables  
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
   

Number of Shares Underlying Warrants (In thousands)

   

Weighted Average Exercise Price

   

Aggregate Fair Market Value at Issuance (In thousands)

   

Weighted Average Remaining Contractual Term (Years)

 

Outstanding June 30, 2024

    80     $ 72.10     $ 3,747       1.60  

Warrants issued

                       

Warrants exercised

                       

Warrants expired

                       

Outstanding September 30, 2024

    80     $ 72.10     $ 3,747       1.35