CONDENSED CONSOLIDATED BALANCE SHEETS (Parentheticals) - $ / shares	Aug. 31, 2018	May 31, 2018	Aug. 31, 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

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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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

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