Note 2 - Acquisition (Detail) - Intangible Assets Acquired (USD $) In Thousands, unless otherwise specified	3 Months Ended
Aug. 31, 2012	Aug. 19, 2011
		$ 779,860
Customer Relationships [Member]
Intangible Asset - Fair Value		455,000
Intangible Asset - Useful Life		20 years
Existing technology and trade names [Member]
Intangible Asset - Fair Value		266,000
Intangible Asset - Useful Life	11 years	11 years
Corporate trade name [Member]
Intangible Asset - Fair Value		40,000
Intangible Asset - Useful Life	15 years	15 years
Below market leasehold interests [Member]
Intangible Asset - Fair Value		860
Intangible Asset - Useful Life	5 years	5 years
In-process research and development [Member]
Intangible Asset - Fair Value		$ 18,000

The aggregate amount assigned to a major class of finite-lived intangible assets acquired either individually or as part of a group of assets (in either an asset acquisition or business combination). A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16265-109275

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Paragraph 44

-Subparagraph a(1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Name:	us-gaap_AcquiredFiniteLivedIntangibleAssetAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant