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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, 2025	Apr. 30, 2024
Due within 1 year	$ 15,407	$ 42,843
Due within 1 year	10	4
Due within 1 year	(1)	(61)
Due within 1 year	15,416	42,786
Due within 1 year through 5 years	7,111	5,088
Due within 1 year through 5 years		0
Due within 1 year through 5 years	(92)	(263)
Due within 1 year through 5 years	7,019	4,825
Total investment in government debt securities	22,518	47,931
Total investment in government debt securities	10	4
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	(93)	(324)
Total investment in government debt securities	$ 22,435	$ 47,611

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