| Fair Value, Assets Measured on Recurring Basis [Table Text Block] |
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Fair Value Measurements Using |
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Quoted Prices in |
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Significant |
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Active Markets |
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Other |
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Significant |
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For Identical |
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Observable |
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Unobservable |
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Balance as of |
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Balance as of |
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Instruments |
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Inputs |
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Inputs |
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April 30, |
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July 31, |
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(Level 1) |
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(Level 2) |
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(Level 3) |
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2016 |
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2015 |
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$ |
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$ |
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$ |
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$ |
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$ |
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Assets: |
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Cash |
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258
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–
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–
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258
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5,586
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