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Note 6 - Stockholders' Equity (Tables)
6 Months Ended
Dec. 31, 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 December 31, 2024

  80  $72.10  $3,747   1.10