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Note 1 - Organization, Basis of Presentation and Summary of Significant Accounting Policies - Assumptions Used in Discounted Cash Flow Models (Details)
$ in Millions
May. 31, 2015
USD ($)
10% increase in revenue growth rates $ 2.3
10% increase in expense growth rates (1.2)
10% increase in income tax rates (0.1)
10% increase in discount rates $ (1.5)