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Note 11 - Business Segment Reporting (Details) - Sales by Geograhic Area (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Aug. 31, 2014
Aug. 25, 2013
CANADA
    
Note 11 - Business Segment Reporting (Details) - Sales by Geograhic Area [Line Items]    
Segment sales $ 17.7 $ 9.4
TAIWAN, PROVINCE OF CHINA
    
Note 11 - Business Segment Reporting (Details) - Sales by Geograhic Area [Line Items]    
Segment sales 16.2 12.0
CHINA
    
Note 11 - Business Segment Reporting (Details) - Sales by Geograhic Area [Line Items]    
Segment sales 4.4 1.6
JAPAN
    
Note 11 - Business Segment Reporting (Details) - Sales by Geograhic Area [Line Items]    
Segment sales 2.8 3.2
INDONESIA
    
Note 11 - Business Segment Reporting (Details) - Sales by Geograhic Area [Line Items]    
Segment sales 1.6 2.5
BELGIUM
    
Note 11 - Business Segment Reporting (Details) - Sales by Geograhic Area [Line Items]    
Segment sales   1.2
All Other Countries [Member]
    
Note 11 - Business Segment Reporting (Details) - Sales by Geograhic Area [Line Items]    
Segment sales $ 3.7 $ 5.3