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Amortized cost, net unrealized gains or losses, and fair values (Details)	3 Months Ended
	Jul. 31, 2022 USD ($)
Available For Sale Securities Amortized Cost [Member]
Asset-backed securities	$ 2,504,563
Corporate bonds	35,544,776
Total	38,049,339
Available For Sale Securities Fair Value [Member]
Asset-backed securities	2,469,239
Corporate bonds	34,239,388
Total	36,708,627
Asset Backed Securities Net Unrealized Gain Losses [Member]
Debt Securities, Available-for-Sale, Unrealized Gain (Loss)	(35,324)
Corporate Bonds Unrealized Gain Losses [Member]
Debt Securities, Available-for-Sale, Unrealized Gain (Loss)	(1,305,388)
Available For Sale Securities Net Unrealized Gain Losses [Member]
Debt Securities, Available-for-Sale, Unrealized Gain (Loss)	$ (1,340,712)

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Investments in notes or bonds that are collateralized by a specific group of underlying assets owned by the issuer of the notes or bonds which are short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Amount of unrealized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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