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Note 2 - Investments - Schedule of Carrying Value and Fair Value of Securities Available-for-sale (Details) - USD ($)	Oct. 31, 2018	Apr. 30, 2018
Cost	$ 8,385,000	$ 8,385,000
Fair value	9,606,000	9,379,000
Due within 1 year, amortized cost	6,455,000	7,868,000
Due within 1 year, gross unrealized gains	17,000	10,000
Due within 1 year, gross unrealized losses	(7,000)	(12,000)
Due within 1 year, fair value	6,465,000	7,866,000
Due 1 year through 5 years, amortized cost	3,000,000	600,000
Due 1 year through 5 years, gross unrealized gains
Due 1 year through 5 years, gross unrealized losses	(11,000)	(1,000)
Due 1 year through 5 years, fair value	2,989,000	599,000
Amortized cost	9,455,000	8,468,000
Gross unrealized gains	17,000	10,000
Gross unrealized losses	(18,000)	(13,000)
Fair value	9,454,000	8,465,000
Exchange Traded Funds [Member]
Cost	8,385,000	8,385,000
Gross unrealized gains	1,225,000	994,000
Gross Unrealized Losses	(4,000)
Fair value	$ 9,606,000	$ 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 gains 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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