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Note 13 - Earnings (Loss) Per Share - Common Stock ("EPS") (Tables)
9 Months Ended
Sep. 30, 2019
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Months ended
September 30,
   
Nine Months ended
September 30,
 
   
201
9
   
201
8
   
201
9
   
201
8
 
                                 
Basic
and Diluted
Numerator:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Net loss
  $
(1,829,567
)
  $
(1,641,315
)
  $
(5,058,818
)
  $
(5,488,772
)
Deemed dividend from trigger of anti-dilution provision feature
   
-
     
(1,428,966
)
   
-
     
(1,428,966
 
Convertible preferred stock dividends
   
-
     
-
     
-
     
(198,033
)
Net loss available to common stockholders
  $
(1,829,567
)
  $
(3,070,281
)
  $
(5,058,818
)
  $
(7,115,771
)
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
9
   
201
8
   
201
9
   
201
8
 
                                 
Stock options
   
1,755,556
     
1,541,558
     
1,755,556
     
1,335,056
 
Warrants
   
5,780,978
     
186,806
     
5,780,978
     
186,806
 
Convertible notes
   
1,912,454
     
-
     
1,143,293
     
-
 
Total
   
9,448,988
     
1,728,364
     
8,679,827
     
1,521,862
 
   
Three Months ended
September 30,
   
Nine Months ended
September 30,
 
   
201
9
   
201
8
   
201
9
   
201
8
 
                                 
Preferred stock
   
-
     
-
     
-
     
1,902,342
 
Stock options
   
-
     
256
     
-
     
11,838
 
Warrants
   
-
     
785,993
     
-
     
992,574
 
Total
   
-
     
786,249
     
-
     
2,906,754