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Note 4 - Investments - Schedule of Carrying Value and Fair Value of Securities Available-for-sale (Details) - USD ($)	Apr. 30, 2019	Apr. 30, 2018
Cost	$ 8,541,000	$ 8,385,000
Fair value	10,622,000	9,379,000
Due within 1 year, amortized cost	6,913,000	7,868,000
Due within 1 year, gross unrealized gains	33,000	10,000
Due within 1 year, fair value	6,946,000	7,866,000
Due 1 year through 5 years, amortized cost	4,250,000	600,000
Due 1 year through 5 years, gross unrealized gains	10,000
Due 1 year through 5 years, fair value	4,260,000	599,000
Amortized cost	11,163,000	8,468,000
Gross unrealized gains	43,000	10,000
Fair value	11,206,000	8,465,000
Due within 1 year, gross unrealized losses		(12,000)
Due 1 year through 5 years, gross unrealized losses		(1,000)
Gross unrealized losses		(13,000)
Exchange Traded Funds [Member]
Cost	8,541,000	8,385,000
Gross unrealized gains	2,081,000	994,000
Fair value	$ 10,622,000	$ 9,379,000

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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Accumulated gross unrealized losses of available-for-sale debt securities maturing in the second fiscal year through the fifth 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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