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Note 4 - Investments (Details Textual) - USD ($) | 12 Months Ended
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Apr. 30, 2016 | Apr. 30, 2015 | Apr. 30, 2014
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 |
Equity Method Investments | [1] | $ 57,942,000 | 58,048,000 |
Percentage of Non Voting Profit Interest |  | 50.00% |  |
Accrued Non Voting Revenues and Non Voting Profits Interests Payable |  | $ 1,750,000 | 1,951,000 |
Equity Securities [Member] |  |  |  |
Proceeds from Sale of Available-for-sale Securities, Equity |  | 10,206,000 |  |
Available-for-sale Securities, Gross Realized Gains |  | 224,000 |  |
Deferred Taxes on Unrealized Gains on Securities |  | 9,000 | 76,000 |
Available-for-sale Securities, Amortized Cost Basis |  | 3,445,000 | 9,470,000 |
Available-for-sale Securities |  | $ 3,637,000 | 9,632,000 |
Percentage of Annual Dividend Return on Investment |  | 3.00% |  |
Proceeds from Sale of Available-for-sale Securities, Equity |  | $ 10,206,000 | 57,000 |
Available-for-sale Securities, Gross Realized Gains | [2] | 224,000 |  |
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Tax, Portion Attributable to Parent |  | 29,000 | (217,000) | (8,000)
Capital Gain Distribution from Available for Sale Securities | [3] | 105,000 | 57,000 | $ 36,000
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax |  | 192,000 | 162,000 |
AOCI Tax, Attributable to Parent |  | 68,000 | 57,000 |
Equity Method Investments |  | $ 57,942,000 | $ 58,048,000 |
[1] | Reported within Long Term Assets on Consolidated Balance Sheets.
[2] | Capital gains of $224,000 were reclassified from Accumulated Other Comprehensive Income in the Consolidated Balance Sheets to the Consolidated Statements of Income in fiscal 2016.
[3] | Capital gain distributions of $105,000 and $57,000 were reclassified from Accumulated Other Comprehensive Income in the Consolidated Balance Sheets to the Consolidated Statements of Income in fiscal 2016 and 2015, respectively.

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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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