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Note 8 - Federal, State and Local Income Taxes (Details Textual) | 6 Months Ended | 12 Months Ended
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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% |  |

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