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Note 7 - Federal, State and Local Income Taxes - Effective Income Tax Rate Reconciliation (Details) | 12 Months Ended
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Apr. 30, 2019 | Apr. 30, 2018 | Apr. 30, 2017
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 21.00% | 30.33% | 35.00%
Effect on deferred tax liabilities from federal tax rate reduction to 21% |  | (54.51%) |
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent | 6.02% | 0.70% | (0.88%)
Effect of dividends received deductions | (0.24%) | (0.49%) | (0.33%)
Domestic production tax credit |  |  | (0.17%)
Other, net | 0.03% | 0.10% | (0.57%)
Effective income tax rate | 26.81% | (23.87%) | 33.05%

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- 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 attributable to changes in the income tax rates. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=116825942&loc=d3e330036-122817 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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