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Note 7 - Loss Per Share (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
    Year Ended
December 31,
    2018   2017
Numerator:        
Net loss available in basic and diluted   $
(10,086,477
 )   $
(6,003,017
 )
                 
Denominator:                
Weighted average common shares outstanding-basic    
12,816,289
      
6,362,989
  
                 
Effect of dilutive stock options warrants and preferred stock (1)    
-
      
-
  
                 
Weighted average common shares outstanding-diluted    
12,816,289
      
6,362,989
  
                 
Loss per common share-basic and diluted   $
(0.79
 )   $
(0.94
 )