Note 7 - Goodwill (Details) (USD $)	3 Months Ended
Feb. 28, 2015	May 31, 2014	May 31, 2013
Disclosure Text Block Supplement [Abstract]
Goodwill, Period Increase (Decrease)	$ (200,000)us-gaap_GoodwillPeriodIncreaseDecrease
Goodwill, Impaired, Accumulated Impairment Loss	$ 160,000,000	$ 160,000,000	$ 0

Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (a,h)

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Name:	us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant