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Note 8 - Stockholders' Equity (Tables)
6 Months Ended
Jun. 30, 2021
Notes Tables  
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
  

2021

 

Warrants outstanding at January 1

  515,000 

Exercises and conversions

  - 

Warrants outstanding at June 30

  515,000 
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]
  

June 30, 2021

 
  

Number of

units

  

Weighted

Average
Grant-Date

Fair value

  

Aggregated

Intrinsic
Value

 
             

Outstanding, December 31, 2020

  128,299  $5.79  $283,541 

Granted

  59,073   8.90   - 

Vested and settled with share issuance

  (41,912

)

  (5.65

)

  - 

Forfeited

  -   -   - 

Outstanding, June 30, 2021

  145,460  $7.09  $33,456