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Goodwill (Details) - USD ($)
$ in Thousands
Oct. 31, 2020
Apr. 30, 2020
Jun. 10, 2019
Goodwill      
Goodwill $ 6,340 $ 6,340  
Pulse Aerospace, LLC      
Goodwill      
Goodwill $ 6,340 $ 6,340 $ 6,340