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Amortized cost, net unrealized gains or losses, and fair values (Details)	12 Months Ended
	Apr. 30, 2022 USD ($)
Available For Sale Securities Amortized Cost [Member]
Money market funds	$ 799,047
Asset-backed securities	2,894,512
Corporate bonds	42,571,104
Total	46,264,663
Available For Sale Securities Fair Value [Member]
Money market funds	799,936
Asset-backed securities	2,861,559
Corporate bonds	41,128,874
Total	44,790,369
Available For Sale Securities Unrealized Gain Loss [Member]
Debt Securities, Available-for-Sale, Unrealized Gain (Loss)	889
Asset Backed Securities Net Unrealized Gain Losses [Member]
Debt Securities, Available-for-Sale, Unrealized Gain (Loss)	(32,953)
Corporate Bonds Unrealized Gain Losses [Member]
Debt Securities, Available-for-Sale, Unrealized Gain (Loss)	(1,442,230)
Available For Sale Securities Net Unrealized Gain Losses [Member]
Debt Securities, Available-for-Sale, Unrealized Gain (Loss)	$ (1,474,294)

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Investment in short-term money-market instruments (such as commercial paper, banker's acceptances, repurchase agreements, government securities, certificates of deposit, and so forth) which are highly liquid (that is, readily convertible to known amounts of cash) and so near their maturity that they present an insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify as cash equivalents by definition. Original maturity means an 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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