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Note 4 - Investments (Details Textual) - USD ($) | 12 Months Ended
--- | ---
Apr. 30, 2023 | Apr. 30, 2022 | Apr. 30, 2021
Equity Securities, FV-NI, Cost | $ 10,169,000 | $ 13,318,000 |
Equity Securities, FV-NI | 14,546,000 | 17,647,000 |
Other Comprehensive Income (Loss), Available-for-Sale Securities Adjustment, Net of Tax, Portion Attributable to Parent | 398,000 | (27,000) | $ (128,000)
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, Tax | 105,000 | (7,000) | (45,000)
Proceeds from Sale of Equity Securities, FV-NI | 4,706,000 | 12,039,000 | $ 8,212,000
Equity Securities, FV-NI, Gain (Loss) | (174,000) | (1,254,000) |
Equity Method Investments | 58,775,000 | 59,971,000 |
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 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 | $ 2,601,000 | 3,657,000 |
Fixed Income Securities [Member] |  |  |
Proceeds from Sale and Maturity of Debt Securities, Available-for-Sale, Total | 9,907,000 | 2,496,000 |
AOCI, Debt Securities, Available-for-Sale, Adjustment, after Tax | 473,000 | 30,000 |
Other Comprehensive Income (Loss), Available-for-Sale Securities Adjustment, Net of Tax, Portion Attributable to Parent | 503,000 | (34,000) |
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, Tax | $ 105,000 | $ (7,000) |
Debt Securities, Available-for-Sale, Weighted Average Yield | 2.55% | 0.60% |
Fixed Income Securities [Member] | AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member] |  |  |
AOCI Tax, Attributable to Parent | $ 99,000 | $ 6,000 |

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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 -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 14 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-14 + Details
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- Definition Weighted average yield of 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 -Name Regulation S-K (SK) -Number 229 -Section 1403 -Paragraph (a) -Publisher SEC + Details
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