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Note 8 - Federal, State and Local Income Taxes - Effective Income Tax Rate Reconciliation (Details)	6 Months Ended		12 Months Ended
	Oct. 31, 2018	Oct. 31, 2017	Apr. 30, 2017
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	35.00%	35.00%
State and local income taxes, net of federal income tax benefit	1.62%	0.17%
Effect of dividends received deductions	0.24%	0.39%
Domestic production tax credit		0.51%
Other, net		0.13%
Effective income tax rate	19.14%	34.40%

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 deduction for dividend.

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