CONDENSED CONSOLIDATED BALANCE SHEETS (Parentheticals) - $ / shares	Aug. 31, 2015	May. 31, 2015	Aug. 31, 2014
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

Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.28)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29

-Article 5

Name:	us-gaap_PreferredStockParOrStatedValuePerShare
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant