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Related Party Transactions (Details) - USD ($)
12 Months Ended
Apr. 30, 2023
Apr. 30, 2022
Apr. 30, 2021
Long-Term Incentive Awards      
Revenue   $ 43,325,000 $ 42,426,000
Due from Related Parties   2,229,000  
Board member | Consulting agreement      
Long-Term Incentive Awards      
Amount paid to related party $ 76,000 36,000 29,000
HAPSMobile | Design and Development Agreement      
Long-Term Incentive Awards      
Due from Related Parties   2,229,000  
SoftBank | Design and Development Agreement      
Long-Term Incentive Awards      
Maximum net value $ 51,200,000    
Revenue   $ 43,325,000 $ 42,426,000