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Note 16 - Earnings (Loss) Per Share - Common Stock (EPS) (Tables)
9 Months Ended
Sep. 30, 2021
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
  

Three Months ended

September 30,

  

Nine Months ended

September 30,

 
  

2021

  

2020

  

2021

  

2020

 

Basic and Diluted Numerator:

                
                 

Net loss

 $(1,023,647

)

 $(3,293,552

)

 $(3,036,761

)

 $(8,236,543

)

Deemed dividends related to down-round features

  -   -   -   (112,686

)

Net loss available to common stockholders (basic and diluted)

 $(1,023,647

)

 $(3,293,552

)

 $(3,036,761

)

 $(8,349,229

)

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
  

Three Months ended

September 30,

  

Nine Months ended

September 30,

 
  

2021

  

2020

  

2021

  

2020

 
                 

Stock options

  212,545   200,382   212,545   200,382 

Warrants

  4,689,387   706,487   4,689,387   706,487 

Total

  4,901,932   906,869   4,901,932   906,869 
  

Three Months ended

September 30,

  

Nine Months ended

September 30,

 
  

2021

  

2020

  

2021

  

2020

 
                 

Stock options

  -   303   -   2,353 

Warrants

  -   39,825   -   368,240 

Restricted stock

  -   1,035   3,598   4,134 

Total

  -   41,163   3,598   374,727