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Note 10 - Disclosure of Credit Risk of Financial Instruments with Off-balance Sheet Risk (Details Textual) | 12 Months Ended
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Apr. 30, 2019 | Apr. 30, 2018 | Apr. 30, 2017
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | One Single Customer [Member] |  |  |
Concentration Risk, Percentage | 20.50% | 17.70% | 10.30%

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