Note 8 - Federal, State and Local Income Taxes (Details Textual) - USD ($) |
3 Months Ended | |||
|---|---|---|---|---|
Jul. 31, 2026 |
Jul. 31, 2025 |
|||
| Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 21.00% | 21.00% | ||
| Effective Income Tax Rate Reconciliation, Percent | 27.00% | 25.20% | ||
| Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent | [1] | 6.40% | 4.39% | |
| Open Tax Year | 2023 2024 2025 | |||
| Former Employee [Member] | ||||
| Deferred Tax Assets, Deferred Non Cash Postemployment Compensation, Noncurrent | $ 1,770,000 | |||
| Asset Management and Mutual Fund Distribution Subsidiaries [Member] | ||||
| Deconsolidation, Gain (Loss), Amount | $ 50,805,000 | |||
| ||||
| X | ||||||||||
- Definition Amount of gain (loss) from deconsolidation of subsidiary and derecognition of group of assets constituting transfer of business or nonprofit activity, excluding conveyance of oil and gas mineral rights and transfer of good or service in contract with customer. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to state and local income tax expense (benefit), net of federal tax expense (benefit). Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
|
| X | ||||||||||
- Definition Tax year that remains open to examination under enacted tax laws, in YYYY format. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Amount of deferred tax asset attributable to deductible temporary differences from deferred non-cash postemployment compensation, expected to be realized or consumed after one year (or the normal operating cycle, if longer). No definition available.
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|