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Note 5 - Stockholders' Equity (Tables)
9 Months Ended
Mar. 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, 2023

  80  $72.10  $3,747   2.60 

Warrants issued

            

Warrants exercised

            

Warrants expired

            

Outstanding March 31, 2024

  80  $72.10  $3,747   1.85 
         

Number of Shares Underlying Warrants (In thousands)

 

Issue Date

 

Classification

 

Exercise Price

 

Expiration Date

 

March 31, 2024

  

June 30, 2023

 

March 26, 2020

 

Equity

 $187.50 

March 25, 2025

  1   1 

March 30, 2020

 

Equity

 $140.63 

March 27, 2025

  2   2 

October 23, 2020

 

Equity

 $86.25 

October 21, 2025

  15   15 

October 28, 2020

 

Equity

 $80.63 

October 28, 2025

  6   6 

February 16, 2021

 

Equity

 $121.88 

February 11, 2026

  6   6 

April 12, 2021

 

Equity

 $56.25 

April 7, 2026

  50   50 

Total Outstanding

         

80

   

80