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Note 2 - Investments - Schedule of Carrying Value and Fair Value of Securities Available-for-sale (Details) - USD ($)	Jan. 31, 2017	Apr. 30, 2016
Available-for-sale Securities, Equity Securities	$ 8,816,000	$ 3,637,000
Amortized Cost	3,635,000
Gross Unrealized Gains	2,000
Gross Unrealized Losses
Fair Value	3,637,000
Amortized Cost	2,500,000
Gross Unrealized Gains
Gross Unrealized Losses	(8,000)
Fair Value	2,492,000
Amortized Cost	6,135,000
Gross Unrealized Gains	2,000
Gross Unrealized Losses	(8,000)
Available-for-sale Securities, Debt Securities	6,129,000	0
Exchange Traded Funds [Member]
Cost	8,385,000	3,445,000
Gross Unrealized Gains	431,000	194,000
Gross Unrealized Losses		(2,000)
Available-for-sale Securities, Equity Securities	$ 8,816,000	$ 3,637,000

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

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