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Note 7 - Loss Per Share
 9 Months Ended
Sep. 30, 2019
Notes to Financial Statements  
Earnings Per Share [Text Block]
NOTE
7
- LOSS PER SHARE
 
The following table presents the shares used in the basic and diluted loss per common share computations:
 
    Three Months Ended September 30   Nine Months Ended September 30
    2019   2018   2019   2018
Numerator:                                
Net loss attributable to common shareholders per common share: basic and diluted calculation   $
(4,134,313
 )   $
(2,506,869
 )   $
(5,982,791
 )   $
(6,640,301
 )
                                 
Denominator:                                
Weighted average common shares outstanding-basic    
3,146,609
      
1,325,261
      
2,581,014
      
1,217,829
  
Effect of diluted stock options, warrants and preferred stock (1)    
-
      
-
      
-
      
-
  
Weighted average common shares outstanding-diluted    
3,146,609
      
1,325,261
      
2,581,014
      
1,217,829
  
Loss per common share-basic and diluted   $
(1.31
 )   $
(1.89
 )   $
(2.32
 )   $
(5.45
 )
 
(
1
) The following is a summary of the number of underlying shares outstanding at the end of the respective periods that have been excluded from the diluted calculations because the effect on loss per common share would have been anti-dilutive:
 
    Three and Nine Months Ended
September 30
    2019   2018
Options    
713,564
      
344,889
  
Warrants    
2,108,277
      
331,927
  
Convertible debt    
103,734
      
504,770
  
Preferred stock: series B    
7,925
      
7,925
  
Preferred stock: series D    
350,000
      
-
  
Preferred stock: series E    
461,503
      
-