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Note 7 - Federal, State and Local Income Taxes (Details Textual) - USD ($)	12 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2019
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	21.00%	21.00%
Effective Income Tax Rate Reconciliation, Percent, Total	23.11%	27.64%	26.38%
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent	2.05%	6.30%	6.02%
Open Tax Year	2018 2019 2020
State and Local Jurisdiction [Member]
Deferred Tax Assets, Deferred Non Cash Postemployment Compensation, Noncurrent	$ (63,000)	$ (88,000)
State and Local Jurisdiction [Member] | New York City Department of Finance [Member]
Income Tax Examination, Year under Examination	2017 2018 2019
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.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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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).

+ References

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Tax year being audited in the income tax examination, in YYYY format.

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Tax year that remains open to examination under enacted tax laws, in YYYY format.

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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).

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