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Note 6 - Loss Per Share
 6 Months Ended
Jun. 30, 2018
Notes to Financial Statements  
Earnings Per Share [Text Block]
NOTE
6
- LOSS PER SHARE
 
The following table presents the shares used in the basic and diluted loss per common share computations:
 
    Three Months Ended June 30,   Six Months Ended June 30,
    2018   2017   2018   2017
Numerator                
 Net loss available in basic and diluted calculation   $
(2,373,410
 )   $
(2,543,670
 )   $
(4,133,432
 )   $
(3,885,517
 )
 Comprehensive loss    
(2,373,410
 )    
(2,543,670
 )    
(4,133,432
 )    
(3,885,517
 )
 Denominator:                                
 Weighted average common shares outstanding-basic    
11,878,490
      
6,167,689
      
11,632,221
      
6,308,554
  
                                 
 Effect of diluted stock options, warrants and preferred stock (1)    
-
      
-
      
-
      
-
  
                                 
 Weighted average common shares outstanding-basic    
11,878,490
      
6,167,689
      
11,632,221
      
6,308,554
  
                                 
 Loss per common share-basic and diluted   $
(0.20
 )   $
(0.41
 )   $
(0.36
 )   $
(0.62
 )
 
 
(
1
) The number of shares underlying options and warrants outstanding as of
June 30, 2018
and
June 30, 2017
are
5,676,637
and
3,850,878,
respectively. The number of shares underlying the preferred stock as of
June 30, 2018
is
79,246.
The effect of the shares that would be issued upon exercise of such options, warrants and preferred stock has been excluded from the calculation of diluted loss per share because those shares are anti-dilutive.