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CONDENSED CONSOLIDATED BALANCE SHEETS (Parentheticals) - $ / shares | Feb. 28, 2018 | May 31, 2017 | Feb. 28, 2017
--- | --- | --- | ---
Preferred stock par value per share (in Dollars per share) | $ 1 | $ 1 | $ 1
Common Stock, par value per share (in Dollars per share) | 0.01 | 0.01 | 0.01
Common Class A |  |  |
Common Stock, par value per share (in Dollars per share) | $ 0.01 | $ 0.01 | $ 0.01

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