Investments - Carrying value and fair value of securities available-for-sale (Details) - USD ($) $ in Thousands	Apr. 30, 2015	Apr. 30, 2014
Schedule of Available-for-sale Securities [Line Items]
Cost	$ 9,470	$ 8,847
Gross Unrealized Gains	1,582	1,327
Gross Unrealized Losses	(1,420)	(948)
Fair Value	9,632	9,226
Common stocks
Schedule of Available-for-sale Securities [Line Items]
Cost	101	101
Gross Unrealized Gains	$ 74	47
Gross Unrealized Losses		(12)
Fair Value	$ 175	136
ETFs - equities
Schedule of Available-for-sale Securities [Line Items]
Cost	3,903	3,878
Gross Unrealized Gains	$ 1,508	1,280
Gross Unrealized Losses		(2)
Fair Value	$ 5,411	5,156
Inverse ETFs - equities
Schedule of Available-for-sale Securities [Line Items]
Cost	$ 5,466	$ 4,868
Gross Unrealized Gains
Gross Unrealized Losses	$ (1,420)	$ (934)
Fair Value	$ 4,046	$ 3,934

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

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)

-URI http://asc.fasb.org/extlink&oid=51813488&loc=d3e22054-111558

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 5

-Subparagraph (aa)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26610-111562

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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

-Subparagraph (SX 210.5-02.2)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Amount of accumulated pre-tax unrealized gains before deducting pre-tax unrealized losses on investments in available-for-sale securities impacting investments.

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Amount of accumulated pre-tax unrealized loss before deducting pre-tax unrealized gain on investments in available-for-sale securities impacting investments.

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