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SEGMENT INFORMATION (Details) - Revenue from External Customers by Products and Services - USD ($)
$ in Thousands
3 Months Ended
Jul. 31, 2020
Jul. 31, 2019
Revenue from External Customer [Line Items]    
Revenue $ 12,951 $ 12,554
Satellite Revenue [Member]    
Revenue from External Customer [Line Items]    
Revenue 6,651 3,895
Government Non-Space Revenue [Member]    
Revenue from External Customer [Line Items]    
Revenue 5,335 6,744
Other Commercial & Industrial Revenue [Member]    
Revenue from External Customer [Line Items]    
Revenue $ 965 $ 1,915