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Note 8 - Federal, State and Local Income Taxes - Effective Income Tax Rate Reconciliation (Details) (Parentheticals) | 4 Months Ended | 9 Months Ended | 12 Months Ended
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Apr. 30, 2018 | Jan. 31, 2018 | Jan. 31, 2017 | Apr. 30, 2019 | Apr. 30, 2018
U.S. statutory federal tax rate |  | 30.33% | 35.00% |  |
Scenario, Forecast [Member] |  |  |  |  |
U.S. statutory federal tax rate | 21.00% |  |  | 21.00% | 30.33%

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