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Note 1 - Nature of Operations and Summary of Significant Accounting Policies (Details) - Property and Equipment, Estimated Useful Lives
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9 Months Ended |
|---|---|
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Jan. 31, 2014
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Building and Building Improvements [Member]
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| Property, Plant and Equipment [Line Items] | |
| Property and equipment, useful lives | 39 years |
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Equipment [Member] | Minimum [Member]
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|
| Property, Plant and Equipment [Line Items] | |
| Property and equipment, useful lives | 3 years |
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Equipment [Member] | Maximum [Member]
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|
| Property, Plant and Equipment [Line Items] | |
| Property and equipment, useful lives | 8 years |