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CASH AND CASH EQUIVALENTS AND SHORT-TERM INVESTMENTS - Schedule of Cash, Cash Equivalents and Short Term Investments (Details) - USD ($)	Jan. 31, 2024	Apr. 30, 2023
CASH AND CASH EQUIVALENTS AND SHORT-TERM INVESTMENTS
Cash and Cash Equivalents	$ 18,013,000	$ 19,993,000
Short-Term Investments	5,043,000	$ 0
Cash
CASH AND CASH EQUIVALENTS AND SHORT-TERM INVESTMENTS
Cash and Cash Equivalents	12,008,000
Certificates of Deposit
CASH AND CASH EQUIVALENTS AND SHORT-TERM INVESTMENTS
Short-Term Investments	2,000,000
U.S. Government Securities
CASH AND CASH EQUIVALENTS AND SHORT-TERM INVESTMENTS
Cash and Cash Equivalents	6,005,000
Short-Term Investments	$ 3,043,000

X

- Definition

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes 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. Excludes cash and cash equivalents within disposal group and discontinued operation.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(1))
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No definition available.

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- Definition

Amount of investments including trading securities, available-for-sale securities, held-to-maturity securities, and short-term investments classified as other and current.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(8))
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