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Note 4 - Investments - Schedule of Carrying Value and Fair Value of Securities Available-for-sale (Details) - USD ($) $ in Thousands | Apr. 30, 2024 | Apr. 30, 2023
--- | --- | ---
Due within 1 year, amortized cost | $ 42,843 | $ 34,384
Due within 1 year, gross unrealized gains | 4 | 486
Due within 1 year, gross unrealized losses | (61) | (5)
Due within 1 year, fair value | 42,786 | 34,865
Due within 1 year through 5 years, amortized cost | 5,088 | 5,071
Due within 1 year through 5 years, gross unrealized losses | (263) | (8)
Due within 1 year through 5 years, fair value | 4,825 | 5,063
Amortized cost | 47,931 | 39,455
Total investment in government debt securities, gross unrealized gains | 4 | 486
Total investment in government debt securities, gross unrealized losses | (324) | (13)
Fair value | $ 47,611 | 39,928
Due 1 year through 5 years, unrealized gains |  | $ 0

X
- Definition 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). + References 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 + Details
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- Definition 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 -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 + Details
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- Definition 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 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479130/326-30-45-1 + Details
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