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Note 8 - Stockholders' Equity (Tables)
 9 Months Ended
Sep. 30, 2019
Notes Tables  
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
   
Warrant shares outstanding
    
Weighted Average exercise price
    
Weighted Average remaining life
    
Intrinsic value
  
Outstanding at January 1, 2019
    
1,592,775
     $
2.55
     $
0.21
      
-
  
Issued
    
1,749,171
     $
0.50
     $
4.35
      
560,199
  
Exercised
    
(57,750
 )   $
0.50
      
-
      
-
  
Expired or cancelled
    
-
      
-
      
-
      
-
  
Outstanding and exercisable at September 30, 2019
    
3,284,196
     $
1.49
     $
2.30
      
560,199
  
Schedule of Warrant or Right Outstanding, Valuation Assumptions [Table Text Block]
   
2016 Warrants
    
2019 Warrants
  
Fair Value of Common Stock
 
  
$.36-$.83
  
 
 $
0.33
  
Expected Term
 
.2-.5 years
  
 
4.9 years
  
Volatility
 
  
86%-100%
  
 
  
83
 %
Dividend yield
 
  
0.00
 %
 
  
0.00
 %
Exercise Price
 
 $
2.55
  
 
 $
0.50
  
Risk-free interest rate
 
  
1.88%-2.09%
  
 
  
2.30
 %
Weighted average fair value of warrants granted
 
 $
-
  
 
 $
0.19
  
Number of shares underlying warrants granted
 
  
1,512,067
  
 
  
1,749,171
  
Warrant Liabilities [Member]  
Notes Tables  
Schedule of Warrant or Right Outstanding, Valuation Assumptions [Table Text Block]
   
2016 Warrants
    
2019 Warrants
  
Fair Value of Common Stock   $
0.83
     $
0.08
  
Expected Term
  
0.2 years
    
4.4 years
  
Volatility
    
86
 %    
86
 %
Dividend yield
    
0.00
 %    
0.00
 %
Exercise Price
   $
2.55
     $
0.50
  
Risk-free interest rate
    
1.88
 %    
1.55
 %
Weighted average fair value of warrants granted
   $
-
     $
0.61
  
Number of shares underlying warrants granted    
1,512,067
      
1,691,421