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Note 7 - Intangible Assets (Details) - Changes in the Carrying Amount of Goodwill (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
May 26, 2013
May 27, 2012
May 29, 2011
Goodwill [Line Items]      
Balance $ 49,620 $ 36,462 $ 41,154
Goodwill acquired/reclassified during the period 0 13,158 88
Goodwill impaired during the period     (4,780)
Balance 49,620 49,620 36,462
Food Products Technology [Member]
      
Goodwill [Line Items]      
Balance 35,739 22,581 22,581
Goodwill acquired/reclassified during the period 0 13,158 0
Goodwill impaired during the period     0
Balance 35,739 35,739 22,581
Corporate [Member]
      
Goodwill [Line Items]      
Balance 0 0 4,780
Goodwill acquired/reclassified during the period 0 0 0
Goodwill impaired during the period     (4,780)
Balance 0 0 0
Hyaluronan-based Biomaterials [Member]
      
Goodwill [Line Items]      
Balance 13,881 13,881 13,793
Goodwill acquired/reclassified during the period 0 0 88
Goodwill impaired during the period     0
Balance $ 13,881 $ 13,881 $ 13,881