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Note 2 - Investments (Details Textual) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended | 15 Months Ended
--- | --- | --- | --- | ---
Jul. 31, 2024 | Jul. 31, 2023 | Jan. 31, 2023 | Apr. 30, 2024 | Jul. 31, 2024
Equity Securities, FV-NI, Cost | $ 16,093,000 |  |  | $ 11,663,000 | $ 16,093,000
Equity Securities, FV-NI, Total | 21,724,000 |  |  | 16,344,000 | 21,724,000
Proceeds from Sale of Equity Securities, FV-NI | 90,000 | $ 516,000 | $ 516,000 |  |
Other Comprehensive Income (Loss), Available-for-Sale Securities Adjustment, Net of Tax, Portion Attributable to Parent | 177,000 | (212,000) |  |  | (212,000)
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, Tax | 47,000 | (58,000) |  |  |
Equity Securities, FV-NI, Gain (Loss) | 0 |  |  | (4,000) |
Equity Method Investments | 60,371,000 |  |  | 60,134,000 | 60,371,000
EAM Trust [Member] |  |  |  |  |
Fair Value of Contributed Capital at Inception | 55,805,000 |  |  | 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 | 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 | $ 4,215,000 |  |  | 3,865,000 | 4,215,000
Fixed Income Securities [Member] |  |  |  |  |
Proceeds from Sale and Maturity of Debt Securities, Available-for-Sale | 16,357,000 | $ 15,750,000 |  |  |
AOCI, Debt Securities, Available-for-Sale, Adjustment, after Tax | 96,000 |  |  | 320,000 | $ 96,000
Other Comprehensive Income (Loss), Available-for-Sale Securities Adjustment, Net of Tax, Portion Attributable to Parent | (224,000) |  |  | (793,000) |
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, Tax | $ 47,000 |  |  | $ 166,000 |
Debt Securities, Available-for-Sale, Weighted Average Yield | 4.30% |  |  | 4.40% | 4.30%
Fixed Income Securities [Member] | AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member] |  |  |  |  |
AOCI Tax, Attributable to Parent | $ 20,000 |  |  | $ 67,000 | $ 20,000

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