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Note 5 - Stockholders' Equity (Tables)
3 Months Ended
Mar. 31, 2022
Notes Tables  
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
          

Aggregate Fair

  

Weighted Average

 
  

Number of Shares

      

Market Value at

  

Remaining

 
  

Underlying Warrants

  

Weighted Average

  

Issuance (In

  

Contractual Term

 
  

(In thousands)

  

Exercise Price

  

thousands)

  

(Years)

 

Outstanding June 30, 2021

  2,393  $2.40  $3,747   4.63 

Warrants issued

            

Warrants exercised

            

Warrants expired

            

Outstanding March 31, 2022

  2,393  $2.40  $3,747   3.85 
         

Number of Shares Underlying Warrants (In thousands)

 

Issue Date

 

Classification

 

Exercise Price

 

Expiration Date

 

March 31, 2022

  

June 30, 2021

 

March 26, 2020

 

Equity

 $6.25 

March 25, 2025

  25   25 

March 30, 2020

 

Equity

 $4.69 

March 27, 2025

  61   61 

October 23, 2020

 

Equity

 $2.88 

October 21, 2025

  470   470 

October 28, 2020

 

Equity

 $2.69 

October 28, 2025

  173   173 

February 16, 2021

 

Equity

 $4.06 

February 11, 2026

  171   171 

April 12, 2021

 

Equity

 $1.88 

April 7, 2026

  1,493   1,493 

Total Outstanding

       2,393   2,393