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Investments - Carrying value and fair value of securities available-for-sale (Details) - USD ($) $ in Thousands	Jul. 31, 2015	Apr. 30, 2015
Schedule of Available-for-sale Securities [Line Items]
Cost	$ 9,607	$ 9,470
Gross Unrealized Gains	1,511	1,582
Gross Unrealized Losses	(1,491)	(1,420)
Fair Value	9,627	9,632
Common stocks
Schedule of Available-for-sale Securities [Line Items]
Cost	101	101
Gross Unrealized Gains	78	$ 74
Gross Unrealized Losses	(28)
Fair Value	151	$ 175
ETFs - equities
Schedule of Available-for-sale Securities [Line Items]
Cost	4,040	3,903
Gross Unrealized Gains	$ 1,433	$ 1,508
Gross Unrealized Losses
Fair Value	$ 5,473	$ 5,411
Inverse ETFs - equities
Schedule of Available-for-sale Securities [Line Items]
Cost	$ 5,466	$ 5,466
Gross Unrealized Gains
Gross Unrealized Losses	$ (1,463)	$ (1,420)
Fair Value	$ 4,003	$ 4,046

X

- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 320



-SubTopic 10



-Section 25



-Paragraph 1



-Subparagraph (b)



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-Name Accounting Standards Codification



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-Section 45



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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 210



-SubTopic 10



-Section S99



-Paragraph 1



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