Note 2 - Investments - Schedule of Carrying Value and Fair Value of Securities Available-for-sale (Details) - USD ($) $ in Thousands	Oct. 31, 2021	Apr. 30, 2021
Due within 1 year, amortized cost	$ 598	$ 2,596
Due within 1 year, gross unrealized losses	(1)
Due within 1 year, fair value	597	2,600
Amortized cost	598	2,596
Total investment in government debt securities, gross unrealized losses	(1)
Fair value	$ 597	2,600
Due within 1 year, gross unrealized gains		4
Gross unrealized gains		$ 4

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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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).

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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).

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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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Accumulated gross unrealized gains available-for-sale debt securities maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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