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Supplementary Cash Flow Information (Detail Textuals) (USD $) In Thousands, unless otherwise specified | 12 Months Ended | 3 Months Ended | 1 Months Ended
--- | --- | --- | ---
Apr. 30, 2013 | Apr. 30, 2012 | Apr. 30, 2011 | Jul. 31, 2010 Prepaid and refundable income taxes | Dec. 23, 2010 Investment In EAM Trust
Supplementary Cash Flow Information [Line Items] |  |  |  |  |
Federal income tax refunds |  |  | $ 1,598 | $ 1,598 |
Investment in EAM Trust | 57,511 | 56,331 |  |  | 55,805
Amount of cash paid in equity method investments |  |  | 5,484 |  | 5,484
Amount of investment through FDIC insured corporate notes |  |  |  |  | 1,516
Share-based compensation |  |  | $ 1,770 |  | $ 1,770

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- Definition This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized. + 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 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=16385135&loc=d3e33749-111570 + Details
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- Definition The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition This item represents the carrying amount on the entity's balance sheet of its investment through FDIC insured corporate notes. + References No definition available. + Details
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- Definition Amount represents federal income tax refund to the parent. + References No definition available. + Details
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