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Note 9 - Stockholders' Equity (Tables)
6 Months Ended
Jun. 30, 2023
Notes Tables  
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
  

2023

  

2022

 

Warrants outstanding at January 1

  4,490,104   126,875 

Warrants issued in connection with public offering and private placement

  -   4,363,229 

Exercises and conversions

  -   - 

Warrants outstanding at June 30

  4,490,104   4,490,104 
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]
  

June 30, 2023

 
  

Number of

units

  

Weighted

Average
Grant-Date

Fair value

  

Aggregated

Intrinsic
Value

 
             

Outstanding, December 31, 2022

  301,111  $4.80  $- 

Granted

  225,604   3.00   - 

Vested and settled with share issuance

  (185,170

)

  (4.63

)

  - 

Outstanding, June 30, 2023

  341,545  $3.69  $-