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Note 8 - Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2019
Notes Tables  
Fair Value Measurements, Recurring and Nonrecurring [Table Text Block]
   
December 31, 2019
   
December 31, 2018
 
Description
 
Level 1
   
Level 2
   
Level 3
   
Level 1
   
Level 2
   
Level 3
 
Cash and marketable securities held in Trust Account
  $
391,964,540
    $
-
    $
-
    $
418,727,517
    $
-
    $
-