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Note 6 - Net (Loss) Per Share (Tables)
 9 Months Ended
Sep. 30, 2020
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Months Ended September 30,
  
Nine Months Ended September 30,
   
2020
  
2019
  
2020
  
2019
Numerator:
                                
Numerator for basic and diluted (loss) per share, net (loss) available to common shareholders
   $
(936,017
 )   $
(1,239,034
 )   $
(3,059,195
 )   $
(3,587,534
 )
Denominator:
                                
Denominator for basic (loss) per share, weighted average shares outstanding
  
15,474,171
  
13,054,962
  
13,924,803
  
12,906,206
Effect of dilutive securities
  
—
  
—
  
—
  
—
Denominator for diluted earnings per share, adjust weighted average shares and assumed conversion
  
15,474,171
  
13,054,962
  
13,924,803
  
12,906,206
Basic (loss) per common share
   $
(0.06
 )   $
(0.09
 )   $
(0.22
 )   $
(0.28
 )
Diluted (loss) per common share and common share equivalent
   $
(0.06
 )   $
(0.09
 )   $
(0.22
 )   $
(0.28
 )
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
   
Nine Months Ended September 30,
   
2020
  
2019
Anti-dilutive awards and options
  
5,244,265
  
3,868,935