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Note 8 - Federal, State and Local Income Taxes (Details Textual)	6 Months Ended		12 Months Ended
	Oct. 31, 2018	Oct. 31, 2017	Apr. 30, 2019	Apr. 30, 2018	Apr. 30, 2017
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	35.00%			35.00%
Effective Income Tax Rate Reconciliation, Percent, Total	19.14%	34.40%
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent				(54.51%)
Open Tax Year	2015 2016 2017 2018
Scenario, Forecast [Member]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent			21.00%

X

- Definition

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 attributable to changes in the income tax rates.

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

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