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Consolidated Balance Sheets (Parentheticals) - $ / shares
May 31, 2019
May 31, 2018
Preferred stock par value (in Dollars per share) $ 1 $ 1
Preferred stock, shares authorized 2,000,000 2,000,000
Preferred stock, shares issued 0 0
Treasury stock (in shares) 9,500,000 9,600,000
Common Stock [Member]    
Common Stock, par value per share (in Dollars per share) $ 0.01 $ 0.01
Common Stock, shares authorized 70,000,000 70,000,000
Common Stock, shares issued 42,900,000 42,900,000
Common Stock, shares outstanding 33,410,323 33,300,000
Class A Stock [Member]    
Common Stock, par value per share (in Dollars per share) $ 0.01 $ 0.01
Common Stock, shares authorized 4,000,000 4,000,000
Common Stock, shares issued 1,700,000 1,700,000
Common Stock, shares outstanding 1,656,200 1,700,000