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Note 2 - Investments (Details Textual) - USD ($) | 3 Months Ended |
--- | --- | ---
Jul. 31, 2016 | Jul. 31, 2015 | Apr. 30, 2016
EAM Trust [Member] |  |  |  |
Fair Value of Contributed Capital at Inception |  | $ 55,805,000 |  | $ 55,805,000
Cash and Liquid Securities in Excess of Working Capital Requirements Contributed to CapitalAccount |  | 5,820,000 |  | 5,820,000
Equity Method Investments | [1] | $ 58,123,000 |  | 57,942,000
Percentage of Non Voting Profit Interest |  | 50.00% |  |
Percentage of Non Voting Profits Interests Due from Ex Subsidiary Payable to Parent under Agreement |  | 90.00% |  |
Accrued Non Voting Revenues and Non Voting Profits Interests Payable |  | $ 1,903,000 |  | 1,750,000
Equity Securities [Member] |  |  |  |
Deferred Taxes on Unrealized Gains on Securities |  | 84,000 | $ 50,000 |
Proceeds from Sale of Available-for-sale Securities, Equity |  | 0 | 0 |
Available-for-sale Securities, Amortized Cost Basis |  | 3,445,000 |  | 3,445,000
Available-for-sale Securities |  | 3,875,000 |  | 3,637,000
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Tax, Portion Attributable to Parent |  | 238,000 | $ (142,000) |
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax |  | 430,000 |  | 192,000
AOCI Tax, Attributable to Parent |  | 151,000 |  | 67,000
Equity Method Investments |  | $ 58,123,000 |  | $ 57,942,000
Percentage of Non Voting Profits Interests Due from Ex Subsidiary Payable to Parent under Agreement |  | 90.00% |  |
Accrued Non Voting Revenues and Non Voting Profits Interests Payable |  | $ 1,903,000 |  |
[1] | Reported within Long Term Assets on Consolidated Balance Sheets.

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- Definition Accumulated appreciation or loss, net of tax, in value of the total of available-for-sale securities at the end of an accounting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669686-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e681-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669646-108580 + Details
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