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Note 2 - Investments - Schedule of Carrying Value and Fair Value of Securities Available-for-sale (Details) - USD ($)	Jul. 31, 2020	Apr. 30, 2020
Cost	$ 15,150,000	$ 12,877,000
ETFs - equities	16,611,000	14,125,000
Due within 1 year, amortized cost	13,935,000	14,652,000
Due within 1 year, gross unrealized gains	127,000	177,000
Due within 1 year, fair value	14,062,000	14,829,000
Amortized cost	13,935,000	14,902,000
Gross unrealized gains	127,000	177,000
Fair value	14,062,000	15,079,000
Due 1 year through 5 years, amortized cost		250,000
Due 1 year through 5 years, gross unrealized gains
Due 1 year through 5 years, fair value		250,000
Exchange Traded Funds [Member]
Cost	15,150,000	12,877,000
Gross unrealized gains	1,461,000	1,317,000
ETFs - equities	$ 16,611,000	14,125,000
ETFs - equities		$ (69,000)

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

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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 before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in equity securities classified as available-for-sale.

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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in equity securities classified as 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), with single maturity date and allocated without single maturity date, maturing in second through fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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