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Note 2 - Investments (Details Textual) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 31, 2024 | Oct. 31, 2023 | Jul. 31, 2023 | Jan. 31, 2023 | Oct. 31, 2022 | Jul. 31, 2022 | Jan. 31, 2024 | Jan. 31, 2023 | Apr. 30, 2023
Equity Securities, FV-NI, Cost | $ 11,109,000 |  |  |  |  |  | $ 11,109,000 |  | $ 10,169,000
Equity Securities, FV-NI | 15,370,000 |  |  |  |  |  | 15,370,000 |  | 14,546,000
Proceeds from Sale of Equity Securities, FV-NI |  |  |  |  |  |  | 1,129,000 | $ 1,421,000 |
Other Comprehensive Income (Loss), Available-for-Sale Securities Adjustment, Net of Tax, Portion Attributable to Parent | 258,000 | $ (448,000) | $ (212,000) | $ 123,000 | $ (3,000) | $ 5,000 | (402,000) | 125,000 |
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, Tax |  |  |  |  |  |  | (106,000) | 33,000 |
Equity Securities, FV-NI, Gain (Loss) |  |  |  |  |  |  | (16,000) | (2,000) |
Equity Method Investments | 59,640,000 |  |  |  |  |  | 59,640,000 |  | 58,775,000
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
Percentage of Non Voting Profit Interest |  |  |  |  |  |  | 50.00% |  |
Accrued Non Voting Revenues and Non Voting Profits Interests Payable | 3,448,000 |  |  |  |  |  | $ 3,448,000 |  | 2,601,000
Equity Method Investment, Other than Temporary Impairment |  |  |  |  |  |  | 0 |  | 0
Fixed Income Securities [Member] |  |  |  |  |  |  |  |  |
Proceeds from Sale and Maturity of Debt Securities, Available-for-Sale |  |  |  |  |  |  | 32,113,000 | $ 9,907,000 |
AOCI, Debt Securities, Available-for-Sale, Adjustment, after Tax | $ 34,000 |  |  |  |  |  | 34,000 |  | 473,000
Other Comprehensive Income (Loss), Available-for-Sale Securities Adjustment, Net of Tax, Portion Attributable to Parent |  |  |  |  |  |  | 508,000 |  | 503,000
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, Tax |  |  |  |  |  |  | $ 106,000 |  | $ 105,000
Debt Securities, Available-for-Sale, Weighted Average Yield | 4.56% |  |  |  |  |  | 4.56% |  | 2.55%
Fixed Income Securities [Member] | AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member] |  |  |  |  |  |  |  |  |
AOCI Tax, Attributable to Parent | $ 6,000 |  |  |  |  |  | $ 6,000 |  | $ 99,000

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