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Note 10 - Stockholders' Equity (Tables)
6 Months Ended
Jun. 30, 2021
Notes Tables  
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
          

Weighted

 
      

Weighted

  

Average

 
      

Average

  

Remaining

 
      

Exercise

  

Contractual

 

Warrants

 

Shares

  

Price

  

Life (Years)

 
             

Outstanding at December 31, 2020

  1,043,667  $3.73   4.7 

Issued

  150,418   2.51   4.2 
Expired  (2,000)  10.50   - 

Outstanding at June 30, 2021

  1,192,085  $3.57   4.3 
             

Exercisable at June 30, 2021

  41,667  $3.00   3.4