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Note 8 - Stockholders' Equity (Tables)
12 Months Ended
Jun. 30, 2023
Notes Tables  
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
  

Shares

  Weighted Average Exercise  Aggregate Fair Market Value at Issuance  

Weighted Average Remaining Contractual Life

 
  

(In thousands)

  

Price

  

(In thousands)

  

(in years)

 

Outstanding at June 30, 2021

  80  $72.10  $3,747   4.63 

Issued

            

Exercised

            

Canceled or expired

            

Outstanding at June 30, 2022

  80  $72.10  $3,747   3.60 

Issued

            

Exercised

            

Canceled or expired

            

Outstanding at June 30, 2023

  80  $72.10  $3,747   2.60 
        

Number of Shares Underlying

 
        

Warrants

 
        

(In thousands)

 
        

For the period ended June 30,

 

Issue Date

 

Classification

Exercise Price

 

Expiration Date

 

2023

  

2022

 

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