Note 2 - Investments - Income from Securities Transactions (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2021	Jan. 31, 2020
Dividend income	$ 155	$ 95	$ 413	$ 247
Interest income	32	66	131	203
Realized gain on sale of equity securities	237	1	1,162	1
Other		5	(1)
Total income from securities transactions, net	$ 424	$ 167	$ 1,705	$ 451

Amount of dividend income on nonoperating securities.

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Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities.

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Amount after accretion (amortization) of discount (premium), and investment expense, of interest income and dividend income on nonoperating securities.

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Amount of realized gain (loss) on investment.

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This item represents investment income (expense) derived from investments in debt and equity securities unless specified in taxonomy.

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