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Note 7 - Stockholders' Equity (Tables)
3 Months Ended
Sep. 30, 2025
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, 2025

  77  $69.04  $3,553   0.63 

Warrants issued

            

Warrants exercised

            

Warrants expired

            

Outstanding September 30, 2025

  77  $69.04  $3,553   0.38