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Note 4 - Investments (Details Textual) - USD ($) | 12 Months Ended
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Apr. 30, 2017 | Apr. 30, 2016 | Apr. 30, 2015
Available-for-sale Equity Securities, Amortized Cost Basis |  | $ 8,385,000 | $ 3,445,000 |
Available-for-sale Securities, Equity Securities |  | 9,097,000 | $ 3,637,000 |
Percentage of Annual Dividend Return on Investment |  |  | 3.00% |
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax |  | 515,000 | $ 192,000 |
AOCI Tax, Attributable to Parent |  | $ 182,000 | 68,000 |
Available-for-sale Securities, Debt Securities, Average Yield |  | 0.40% |  |
Available-for-sale Securities, Debt Securities |  | $ 7,479,000 | 0 |
Capital Gain Distribution from Available for Sale Securities | [1] | 39,000 | 105,000 | $ 57,000
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Tax, Portion Attributable to Parent |  | 515,000 | 29,000 | (217,000)
Proceeds from Sale of Available-for-sale Securities, Equity |  | 53,000 | 10,206,000 | $ 57,000
Equity Method Investments |  | 58,223,000 | 57,942,000 |
EAM Trust [Member] |  |  |  |
Equity Method Investments | [2] | $ 58,223,000 | 57,942,000 |
Percentage of Non Voting Profit Interest |  | 50.00% |  |
Accrued Non Voting Revenues and Non Voting Profits Interests Payable |  | $ 1,919,000 | 1,750,000 |
Cash and Liquid Securities in Excess of Working Capital Requirements Contributed to CapitalAccount |  | 5,820,000 | 5,820,000 |
Equity Method Investment, Other than Temporary Impairment |  | 0 | 0 |
Fair Value of Contributed Capital at Inception |  | 55,805,000 | 55,805,000 |
AOCI Attributable to Parent [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax |  | 5,000 |  |
AOCI Tax, Attributable to Parent |  | 1,000 |  |
Equity Securities [Member] |  |  |  |
Available-for-sale Securities, Gross Realized Gain (Loss) |  | 0 |  |
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Tax, Portion Attributable to Parent |  | 520,000 | 29,000 |
Deferred Taxes on Unrealized Gains on Securities |  | $ 183,000 | 9,000 |
Available-for-sale Securities, Gross Realized Gains |  |  | 224,000 |
Debt Securities [Member] |  |  |  |
Proceeds from Sale and Maturity of Available-for-sale Securities |  |  | $ 0 |
[1] | Capital gain distributions of $39,000, $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 2017, 2016 and 2015, respectively.
[2] | 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=84228862&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=84228862&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=84228862&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=84228862&loc=SL7669646-108580 + Details
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