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Note 2 - Investments (Details Textual) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 31, 2019 | Jul. 31, 2018 | Apr. 30, 2019
Available-for-sale Equity Securities, Amortized Cost Basis, Total |  | $ 8,940,000 |  | $ 8,541,000
Available-for-sale Securities, Equity Securities |  | 11,112,000 |  | $ 10,622,000
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Tax, Portion Attributable to Parent, Total |  | 109,000 | $ 539,000 |
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, Tax |  | $ 23,000 | 113,000 |
Available-for-sale Securities, Debt Securities, Average Yield |  | 2.41% |  | 2.09%
Equity Method Investments |  | $ 58,971,000 |  | $ 58,625,000
EAM Trust [Member] |  |  |  |
Equity Method Investments | [1] | 58,971,000 |  | 58,625,000
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 Capital Account |  | 5,820,000 |  | 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 |  | 2,843,000 |  | $ 2,420,000
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 |  | 90,000 | 538,000 |
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, Tax |  | 19,000 | 113,000 |
AOCI, Debt Securities, Available-for-sale, Adjustment, after Tax, Total |  | 2,172,000 | 2,082,000 |
AOCI Tax, Attributable to Parent |  | 456,000 | 437,000 |
Proceeds from Sale and Maturity of Debt Securities, Available-for-sale, Total |  | 2,973,000 |  |
Debt Securities [Member] |  |  |  |
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Tax, Portion Attributable to Parent, Total |  | 18,000 | (2,000) |
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, Tax |  | 4,000 | (1,000) |
AOCI, Debt Securities, Available-for-sale, Adjustment, after Tax, Total |  | 61,000 | 43,000 |
AOCI Tax, Attributable to Parent |  | $ 13,000 | 9,000 |
Proceeds from Sale and Maturity of Debt Securities, Available-for-sale, Total |  |  | $ 1,637,000 |
[1] | Reported within Long-Term Assets on the Consolidated Condensed 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 the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities. + 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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- 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109237563&loc=d3e33749-111570 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8813-108599 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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