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Note 9 - Earnings Per Share ("EPS") (Tables)
3 Months Ended
Mar. 31, 2018
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Months ended
March 31,
 
   
201
8
   
201
7
 
                 
Basic Numerator:
 
 
 
 
 
 
 
 
                 
Net loss
  $
(2,191,992
)
  $
(1,356,187
)
Convertible preferred stock dividends
   
(156,162
)
   
(200,625
)
Net loss available to common stockholders (basic and diluted)
  $
(2,348,154
)
  $
(1,556,812
)
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
   
Three Months ended
March 31,
 
   
201
8
   
201
7
 
                 
Preferred stock
   
4,506,259
     
5,416,667
 
Stock options
   
4,542
     
54,512
 
Warrants
   
-
     
3,668
 
Total
   
4,510,801
     
5,474,847
 
   
Three Months Ended
March 31,
 
   
201
8
   
201
7
 
                 
Stock options
   
1,468,325
     
218,761
 
Warrants
   
1,398,969
     
1,212,163
 
Total
   
2,867,294
     
1,430,924