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Note 2 - Investments - Schedule of Carrying Value and Fair Value of Securities Available-for-sale (Details) - USD ($)	Jul. 31, 2019	Apr. 30, 2019
Cost	$ 8,940,000	$ 8,541,000
Fair value	11,112,000	10,622,000
Due within 1 year, amortized cost	6,411,000	6,913,000
Due within 1 year, gross unrealized gains	35,000	33,000
Due within 1 year, fair value	6,446,000
Due 1 year through 5 years, amortized cost	5,000,000	4,250,000
Due 1 year through 5 years, gross unrealized gains	27,000	10,000
Due 1 year through 5 years, fair value	5,027,000
Amortized cost	11,411,000	11,163,000
Gross unrealized gains	62,000	43,000
Fair value	11,473,000
Due within 1 year, gross unrealized losses		6,946,000
Due 1 year through 5 years, gross unrealized losses		4,260,000
Gross unrealized losses		11,206,000
Exchange Traded Funds [Member]
Cost	8,940,000	8,541,000
Gross unrealized gains	2,172,000	2,081,000
Fair value	$ 11,112,000	$ 10,622,000

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).

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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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