Quarterly report pursuant to Section 13 or 15(d)

Note 4 - Prepaid Expenses (Tables)

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Note 4 - Prepaid Expenses (Tables)
3 Months Ended
Mar. 31, 2021
Notes Tables  
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Table Text Block]
    March 31,     December 31,  
    2021     2020  
             
Prepaid research and development expenses   $
634
    $
622
 
Other prepaid expenses    
1,312
     
1,932
 
    $
1,946
    $
2,554