Note 2 - Investments - Schedule of Carrying Value and Fair Value of Securities Available-for-sale (Details) - USD ($) $ in Thousands	Oct. 31, 2023	Apr. 30, 2023
Due within 1 year, amortized cost	$ 38,133	$ 34,384
Due within 1 year, gross unrealized gains	0	486
Due within 1 year, gross unrealized losses	(43)	(5)
Due within 1 year, fair value	38,090	34,865
Due within 1 year through 5 years, amortized cost	5,136	5,071
Due 1 year through 5 years, unrealized gains	0
Due within 1 year through 5 years, gross unrealized losses	(320)	(8)
Due within 1 year through 5 years, fair value	4,816	5,063
Amortized cost	43,269	39,455
Total investment in government debt securities, gross unrealized gains	0	486
Total investment in government debt securities, gross unrealized losses	(363)	(13)
Fair value	$ 42,906	$ 39,928

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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-2

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 210
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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Amount of 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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
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