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Amortized cost, net unrealized gains or losses, and fair values (Details)
6 Months Ended
Oct. 31, 2022
USD ($)
Available For Sale Securities Amortized Cost [Member]  
Asset-backed securities $ 1,663,414
Corporate bonds 31,330,997
Total 32,994,411
Available For Sale Securities Fair Value [Member]  
Asset-backed securities 1,635,712
Corporate bonds 29,667,176
Total 31,302,888
Asset Backed Securities Net Unrealized Gain Losses [Member]  
Debt Securities, Available-for-Sale, Unrealized Gain (Loss) (27,702)
Corporate Bonds Unrealized Gain Losses [Member]  
Debt Securities, Available-for-Sale, Unrealized Gain (Loss) (1,663,821)
Available For Sale Securities Net Unrealized Gain Losses [Member]  
Debt Securities, Available-for-Sale, Unrealized Gain (Loss) $ (1,691,523)