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Note 9 - Loss Per Share - Common Stock ("EPS") (Tables)
9 Months Ended
Sep. 30, 2018
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Months ended
September 30,
   
Nine Months ended
September 30,
 
   
201
8
   
201
7
   
201
8
   
201
7
 
                                 
Basic Numerator:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Net loss
  $
(1,641,315
)
  $
(1,605,784
)
  $
(5,488,772
)
  $
(4,751,301
)
Deemed dividend from trigger of anti-dilution provision feature    
(1,428,966
)    
-
     
(1,428,966
)    
-
 
Convertible preferred stock dividends
   
-
     
(200,625
)
   
(198,033
)
   
(601,875
)
Net loss available to common stockholders
  $
(3,070,281
)
  $
(1,806,409
)
  $
(7,115,771
)
  $
(5,353,176
)
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
   
Three Months ended
September 30,
   
Nine Months ended
September 30,
 
   
201
8
   
201
7
   
201
8
   
201
7
 
                                 
Preferred stock
   
-
     
5,416,667
     
1,902,342
     
5,416,667
 
Stock options
   
256
     
205,497
     
11,838
     
101,327
 
Warrants
   
785,993
     
9,492
     
992,574
     
5,608
 
Total
   
786,249
     
5,631,656
     
2,906,754
     
5,523,602
 
   
Three Months ended
September 30,
   
Nine Months ended
September 30,
 
   
201
8
   
201
7
   
201
8
   
201
7
 
                                 
Stock options
   
1,541,558
     
262,094
     
1,335,056
     
278,761
 
Warrants
   
186,806
     
1,351,052
     
186,806
     
1,351,052
 
Total
   
1,728,364
     
1,613,146
     
1,521,862
     
1,629,813