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Note 5 - Stockholders' Equity (Tables)
 9 Months Ended
Sep. 30, 2020
Notes Tables  
Share-based Payment Arrangement, Option, Activity [Table Text Block]
   
 
Number of
Options
    
 
Weighted
Average
Exercise
Price
    
 
Weighted
Average
Remaining
Contractual
Term
(in years)
    
 
Aggregate
Intrinsic
Value
  
Outstanding, December 31, 2019
    
1,666,797
     $
13.96
      
7.22
     $
91,475
  
Granted
    
571,000
     $
2.19
      
 
      
 
  
Exercised, cancelled, or forfeited
    
(198,750
)
   $
7.52
      
 
      
 
  
Outstanding, September 30, 2020
    
2,039,047
     $
11.29
      
7.15
     $
528,580
  
                                 
Exercisable, September 30, 2020
    
1,116,314
     $
17.49
      
5.6
     $
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