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Note 11 - Warrants (Tables)
3 Months Ended
Mar. 31, 2023
Notes Tables  
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
  

Warrants

 
          

Weighted

 
      

Weighted

  

Average

 
      

Average

  

Remaining

 
      

Exercise

  

Contractual

 
  

Amount

  

Price

  

Life

 

Balance December 31, 2022

  5,824,027  $6.56   4.21 

Warrants expired

  (20,577)  10.26   - 

Balance March 31, 2023

  5,803,450  $6.54   3.97