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Related Party Transactions (Details) - USD ($)
12 Months Ended
Apr. 30, 2022
Apr. 30, 2021
Apr. 30, 2020
Long-Term Incentive Awards      
Revenue $ 43,325,000 $ 42,426,000 $ 60,864,000
Unbilled related party receivables 2,229,000 544,000  
Board member | Consulting agreement      
Long-Term Incentive Awards      
Amount paid to related party 36,000 29,000 59,000
HAPSMobile | Design and Development Agreement      
Long-Term Incentive Awards      
Maximum net value 185,202,000    
Unbilled related party receivables 2,229,000 544,000  
SoftBank | Design and Development Agreement      
Long-Term Incentive Awards      
Maximum net value 51,200,000    
Revenue $ 43,325,000 $ 42,426,000 $ 60,864,000