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Note 5 - Stock-based Compensation; Changes in Equity (Tables)
 6 Months Ended
Jun. 30, 2020
Notes Tables  
Share-based Payment Arrangement, Activity [Table Text Block]
   
Shares under
Option
    
Weighted
Average
Exercise
Price
  
Balance at December 31, 2019
    
471,144
     $
3.95
  
Granted
    
792,660
      
1.00
  
Cancelled/Expired
    
(436,519
 )    
3.95
  
Exercised/Issued
    
(15,000
 )    
5.48
  
Outstanding at June 30, 2020
    
812,285
      
1.21
  
                 
Exercisable at June 30, 2020
    
19,625
     $
5.49