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Note 7 - Stockholders' Equity (Tables)
12 Months Ended
Dec. 31, 2021
Notes Tables  
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
     

 

 

Weighted Average

 
     

Weighted Average

 

Remaining

 

Warrants

 

Shares

 

Exercise Price

 

Contractual Life (Years)

 

Outstanding as of January 1, 2020

  43,667 $3.34  4.72 

Issued

  1,000,000  3.75  4.73 

Outstanding as of December 31, 2020

  1,043,667 $3.73  4.69 

Issued

  150,418  2.51  4.12 
Expired  (2,000) 10.50  - 

Outstanding as of December 31, 2021

  1,192,085 $3.57  3.75 
           

Exercisable as of December 31, 2021

  1,041,667 $3.72  3.70