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Investments - Carrying value and fair value of securities available-for-sale (Details) (USD $) In Thousands, unless otherwise specified | Jan. 31, 2014 | Apr. 30, 2013
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | $ 8,847 | $ 6,295
Gross Unrealized Gains | 1,008 | 767
Gross Unrealized Losses | (695) | (380)
Fair Value | 9,160 | 6,682
Common stocks |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 101 | 103
Gross Unrealized Gains | 47 | 27
Gross Unrealized Losses | (18) | (16)
Fair Value | 130 | 114
ETFs - equities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 3,878 | 3,878
Gross Unrealized Gains | 961 | 740
Gross Unrealized Losses | (8) |
Fair Value | 4,831 | 4,618
Inverse ETFs - equities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 4,868 | 2,314
Gross Unrealized Gains |  |
Gross Unrealized Losses | (669) | (364)
Fair Value | $ 4,199 | $ 1,950

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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=28360136&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=6871852&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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- Definition Amount of accumulated pre-tax unrealized gains before deducting pre-tax unrealized losses on investments in available-for-sale securities impacting investments. + References No definition available. + Details
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- Definition Amount of accumulated pre-tax unrealized loss before deducting pre-tax unrealized gain on investments in available-for-sale securities impacting investments. + References No definition available. + Details
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