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Note 7 - Intangible Assets (Details) - Goodwill (USD $) In Thousands, unless otherwise specified	12 Months Ended			12 Months Ended
	May 27, 2012	May 25, 2014	May 26, 2013	May 27, 2012 Food Products Technology [Member]	May 25, 2014 Food Products Technology [Member]	May 26, 2013 Food Products Technology [Member]	May 25, 2014 HA-based Biomaterials [Member]	May 26, 2013 HA-based Biomaterials [Member]	May 27, 2012 HA-based Biomaterials [Member]	May 29, 2011 HA-based Biomaterials [Member]
Goodwill [Line Items]
Balance	$ 36,462	$ 49,620	$ 49,620	$ 22,581	$ 35,739	$ 35,739	$ 13,881	$ 13,881	$ 13,881	$ 13,881
Goodwill acquired during the period	13,158			13,158
Balance	$ 49,620	$ 49,620	$ 49,620	$ 35,739	$ 35,739	$ 35,739	$ 13,881	$ 13,881	$ 13,881	$ 13,881

X

- Definition

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

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

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



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

+ Details

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

X

- Definition

Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

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)

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

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	us-gaap_GoodwillLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration