Schedule of Investments and Unrealized Gains/Losses (Details) $ in Thousands	12 Months Ended
Apr. 30, 2022 USD ($)
Accounting Policies [Abstract]
Cost or Amortized Cost	$ 49,384
Gross Unrealized Gains	81
Gross Unrealized Losses	(414)
Estimated Fair Value	49,051
Net Unrealized Gains/(Losses)	$ (333)

The sum of the periodic adjustments of the differences between securities' face values and purchase prices that are charged against earnings. This is called accretion if the security was purchased at a discount and amortization if it was purchased at premium. As a noncash item, this element is an adjustment to net income when calculating cash provided by or used in operations using the indirect method.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585

Name:	us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration