Note 2 - Investments - Schedule of Carrying Value and Fair Value of Securities Available-for-sale (Details) - USD ($)	Oct. 31, 2019	Apr. 30, 2019
Cost	$ 9,447,000	$ 8,541,000
Fair value	11,932,000	10,622,000
Due within 1 year, amortized cost	7,411,000	6,913,000
Due within 1 year, gross unrealized gains	80,000	33,000
Due within 1 year, fair value	7,491,000	6,946,000
Due 1 year through 5 years, amortized cost	2,250,000	4,250,000
Due 1 year through 5 years, gross unrealized gains	17,000	10,000
Due 1 year through 5 years, fair value	2,267,000	4,260,000
Amortized cost	9,661,000	11,163,000
Gross unrealized gains	97,000	43,000
Fair value	9,758,000	11,206,000
Exchange Traded Funds [Member]
Cost	9,447,000	8,541,000
Gross unrealized gains	2,485,000	2,081,000
Fair value	$ 11,932,000	$ 10,622,000

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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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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This item represents the cost of equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments for other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), maturing in next fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.

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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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Amount of equity securities categorized neither as held-to-maturity nor as trading.

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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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