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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

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- 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) -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 + Details
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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + 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 + Details
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