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Note 4 - Investments (Details Textual) - USD ($) | 12 Months Ended
--- | ---
Apr. 30, 2024 | Apr. 30, 2023 | Apr. 30, 2022
Equity Securities, FV-NI, Cost | $ 11,663,000 | $ 10,169,000 |
Equity Securities, FV-NI | 16,344,000 | 14,546,000 |
Other Comprehensive Income (Loss), Available-for-Sale Securities Adjustment, Net of Tax, Portion Attributable to Parent | (627,000) | 398,000 | $ (27,000)
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, Tax | (166,000) | 105,000 | (7,000)
Proceeds from Sale of Equity Securities, FV-NI | 1,129,000 | 4,706,000 | $ 12,039,000
Equity Securities, FV-NI, Gain (Loss) | (16,000) | (174,000) |
Equity Method Investments | 60,134,000 | 58,775,000 |
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 | $ 3,865,000 | 2,601,000 |
Fixed Income Securities [Member] |  |  |
Proceeds from Sale and Maturity of Debt Securities, Available-for-Sale | 37,114,000 | 9,907,000 |
AOCI, Debt Securities, Available-for-Sale, Adjustment, after Tax | (320,000) | 473,000 |
Other Comprehensive Income (Loss), Available-for-Sale Securities Adjustment, Net of Tax, Portion Attributable to Parent | (793,000) | 503,000 |
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, Tax | $ 166,000 | $ 105,000 |
Debt Securities, Available-for-Sale, Weighted Average Yield | 4.40% | 2.55% |
Fixed Income Securities [Member] | AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member] |  |  |
AOCI Tax, Attributable to Parent | $ 67,000 | $ 99,000 |

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