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Note 10 - Business Segment Reporting - Sales by Geograhic Area (Details) - USD ($)
$ in Millions
3 Months Ended
Aug. 30, 2015
Aug. 31, 2014
CANADA    
Segment sales $ 20.7 $ 17.7
TAIWAN, PROVINCE OF CHINA    
Segment sales 13.0 16.2
CHINA    
Segment sales 4.0 4.4
JAPAN    
Segment sales 2.0 2.8
INDONESIA    
Segment sales 1.5 $ 1.6
BELGIUM    
Segment sales 0.8
All Other Countries [Member]    
Segment sales $ 4.3 $ 3.7