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Note 9 - Equity Transactions (Tables)
12 Months Ended
Dec. 31, 2022
Notes Tables  
Schedule of Share-based Compensation, Stock Warrants Activity [Table Text Block]

Warrants outstanding, December 31, 2020

  3,662,661 

Issued

  - 

Exercised

  (1,599,204)

Expired

  (15,271)

Warrants outstanding, December 31, 2021

  2,048,186 

Issued

  - 

Exercised

  - 

Expired

  (2,340

)

Warrants outstanding, December 31, 2022

  2,045,846 
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]

Warrants Issued

  

Exercise Price

 

Expiration Date

       
1,000  $55 

June 2023

84,800  $25 

June 2023

60,837  $35 

February 2024

2,400  $25 

October 2024

57,600  $25 

October 2024

302,379  $9.37 

November 2024

80,000  $25 

April 2025

35,200  $65 

December 2025

2,223  $11 

September 2025

283,111  $15 

September 2027

1,078,796  $5 

December 2025

57,500  $6.25 

December 2025

2,045,846