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Note 11 - Earnings Per Share ("EPS") (Tables)
3 Months Ended
Mar. 31, 2019
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Months ended
March 31,
 
   
201
9
   
201
8
 
                 
Basic Numerator:
 
 
 
 
 
 
 
 
                 
Net loss
  $
(1,803,508
)
  $
(2,191,992
)
Convertible preferred stock dividends
   
-
     
(156,162
)
Net loss available to common stockholders (basic and diluted)
  $
(1,803,508
)
  $
(2,348,154
)
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
   
Three Months ended
March 31,
 
   
201
9
   
201
8
 
                 
Preferred stock
   
-
     
4,506,259
 
Stock options
   
-
     
4,542
 
Warrants
   
-
     
-
 
Total
   
-
     
4,510,801
 
   
Three Months Ended
March 31,
 
   
201
9
   
201
8
 
                 
Stock options
   
1,794,737
     
1,468,325
 
Warrants
   
3,780,976
     
1,398,969
 
Total
   
5,575,713
     
2,867,294