Note 2 - Investments - Schedule of Carrying Value and Fair Value of Securities Available-for-sale (Details) - USD ($) $ in Thousands	Jan. 31, 2025	Apr. 30, 2024
Due within 1 year, amortized cost	$ 20,218	$ 42,843
Due within 1 year, gross unrealized gains	29	4
Due within 1 year, gross unrealized losses	20,247	(61)
Due 1 year through 5 years, amortized cost	7,051	5,088
Due within 1 year, fair value		42,786
Due 1 year through 5 years, gross unrealized gains	0	0
Due 1 year through 5 years, gross unrealized losses	(131)	(263)
Due 1 year through 5 years	6,920	4,825
Amortized cost	27,269	47,931
Total investment in government debt securities, gross unrealized gains	29	4
Total investment in government debt securities, gross unrealized losses	(131)	(324)
Fair value	$ 27,167	$ 47,611

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).

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