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Note 4 - Schedule of Carrying Value and Fair Value of Securities Available-for-sale (Details) - USD ($) | Apr. 30, 2016 | Apr. 30, 2015
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Exchange Traded Funds [Member] |  |
Available-for-sale Securities, Amortized Cost Basis | $ 3,445,000 | $ 3,903,000
Gross Unrealized Gains | 194,000 | 1,508,000
Gross Unrealized Losses | (2,000) |
Available-for-sale Securities | 3,637,000 | 5,411,000
Common Stock [Member] |  |
Available-for-sale Securities, Amortized Cost Basis |  | 101,000
Gross Unrealized Gains |  | 74,000
Gross Unrealized Losses |  |
Available-for-sale Securities |  | 175,000
Inverse Exchange Traded Funds [Member] |  |
Available-for-sale Securities, Amortized Cost Basis |  | 5,466,000
Gross Unrealized Gains |  |
Gross Unrealized Losses |  | (1,420,000)
Available-for-sale Securities |  | 4,046,000
Available-for-sale Securities, Amortized Cost Basis | 3,445,000 | 9,470,000
Gross Unrealized Gains |  | 1,582,000
Gross Unrealized Losses |  | (1,420,000)
Available-for-sale Securities | $ 3,637,000 | $ 9,632,000

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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=65884222&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=73527792&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=66010992&loc=d3e26610-111562 + Details
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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 + Details
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- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 + 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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