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Note 4 - Investments (Details Textual) - USD ($) | 12 Months Ended
--- | ---
Apr. 30, 2019 | Apr. 30, 2018 | Apr. 30, 2017
Available-for-sale Equity Securities, Amortized Cost Basis, Total |  | $ 8,541,000 | $ 8,385,000 |  |  |
Available-for-sale Securities, Equity Securities |  | 10,622,000 | 9,379,000 |  |  |
Proceeds from Sale of Available-for-sale Securities, Equity |  | 0 | 152,000 |  | $ 53,000 |
Capital Gain Distribution from Available for Sale Securities |  | 0 | 152,000 | [1] | 39,000 | [1]
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Tax, Portion Attributable to Parent, Total |  | $ 1,133,000 | 285,000 |  | 515,000 |
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, Tax |  |  | $ (8,000) |  | $ 196,000 |
Available-for-sale Securities, Debt Securities, Average Yield |  | 2.09% | 1.24% |  |  |
AOCI, Debt Securities, Available-for-sale, Adjustment, after Tax, Total |  | $ (1,133,000) | $ (285,000) |  |  |
AOCI Tax, Attributable to Parent |  | (238,000) | (40,000) |  |  |
Equity Method Investments |  | 58,625,000 | 58,233,000 |  |  |
EAM Trust [Member] |  |  |  |  |  |
Equity Method Investments | [2] | 58,625,000 | 58,233,000 |  |  |
Fair Value of Contributed Capital at Inception |  | 55,805,000 |  |  |  |
Cash and Liquid Securities in Excess of Working Capital Requirements Contributed to CapitalAccount |  |  | 5,820,000 |  |  |
Equity Method Investment, Other than Temporary Impairment |  | $ 0 | 0 |  |  |
Percentage of Non Voting Profit Interest |  | 50.00% |  |  |  |
Accrued Non Voting Revenues and Non Voting Profits Interests Payable |  | $ 2,420,000 | 2,113,000 |  |  |
Equity Securities [Member] |  |  |  |  |  |
Available-for-sale Securities, Gross Realized Gain (Loss), Total |  | 0 | 0 |  |  |
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Tax, Portion Attributable to Parent, Total |  | 1,087,000 | 282,000 |  |  |
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, Tax |  | 228,000 | 42,000 |  |  |
Debt Securities [Member] |  |  |  |  |  |
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Tax, Portion Attributable to Parent, Total |  | 46,000 | (2,500) |  |  |
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, Tax |  | $ 10,000 | $ (1,200) |  |  |
[1] | Capital gain distributions of $152,000 and $39,000 were reclassified from Accumulated Other Comprehensive Income in the Consolidated Balance Sheets to the Consolidated Statements of Income in fiscal 2018 and 2017, respectively.
[2] | Reported within Long-Term Assets on Consolidated Balance Sheets.

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- Definition Amount, after tax, of accumulated unrealized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e681-108580 + Details
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- Definition This item represents the cost of equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments for other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References No definition available. + Details
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- Definition This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 35 -Paragraph 32 -URI http://asc.fasb.org/extlink&oid=118954474&loc=d3e32787-111569 + Details
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