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Note 7 - Loss Per Share (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,
    2019   2018
Numerator                
Net loss available in basic and diluted calculation   $
(3,293,184
 )   $
(1,760,022
 )
Comprehensive loss    
(3,293,184
 )    
(1,760,022
 )
Denominator:                
Weighted average common shares outstanding-basic    
15,731,517
      
11,383,217
  
                 
Effect of diluted stock options warrants and preferred stock (1)    
-  
      
-  
  
                 
Weighted average common shares outstanding-basic and diluted    
15,731,517
      
11,383,217
  
                 
Loss per common share-basic and diluted   $
(0.21
 )   $
(0.15
 )