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Amortized cost, net unrealized gains or losses, and fair values (Details)	9 Months Ended
	Jan. 31, 2022 USD ($)
Available For Sale Securities Amortized Cost [Member]
Money market funds	$ 1,598,428
Asset-backed securities	3,113,823
Corporate bonds	44,387,966
Total	49,100,217
Available For Sale Securities Fair Value [Member]
Money market funds	1,599,536
Asset-backed securities	3,091,839
Corporate bonds	43,754,927
Total	48,446,302
Available For Sale Securities Unrealized Gain Loss [Member]
Debt Securities, Available-for-sale, Unrealized Gain (Loss)	1,108
Asset Backed Securities Net Unrealized Gain Losses [Member]
Debt Securities, Available-for-sale, Unrealized Gain (Loss)	(21,984)
Corporate Bonds Unrealized Gain Losses [Member]
Debt Securities, Available-for-sale, Unrealized Gain (Loss)	(633,039)
Available For Sale Securities Net Unrealized Gain Losses [Member]
Debt Securities, Available-for-sale, Unrealized Gain (Loss)	$ (653,915)

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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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