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Note 10 - Stockholders' Equity (Tables)
12 Months Ended
Dec. 31, 2020
Notes Tables  
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
  

2020

 

Warrants outstanding at January 1

  - 

Prefunded warrants issued in May 2020

  515,000 

Exercises and conversions

  - 

Warrants outstanding at December 31

  515,000 
Schedule of Stockholders' Equity Note, Warrants or Rights Activity [Table Text Block]

Base value of warrants, 515,000 warrants at $5

 $2,575,000 

Fair value adjustment

  901,250 

Balance at August 12, 2020 reclassified to equity

 $3,476,250 
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]
  

December 31, 2020

 
  

Number of

units

  

Weighted

Average
Grant-Date

Fair value

  

Aggregated

Intrinsic
Value

 
             

Outstanding, December 31, 2019

  133,747  $5.47  $50,824 

Granted

  44,430   6.47   - 

Vested and settled with share issuance

  (33,211

)

  4.15   - 

Forfeited

  (16,667

)

  8.32   - 

Outstanding, December 31, 2020

  128,299  $5.79  $250,183