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Note 11 - Business Segment Reporting - Sales by Geographic Area (Details) - USD ($)
$ in Millions
12 Months Ended
May 28, 2017
May 29, 2016
May 31, 2015
CANADA      
Segment sales $ 69.3 $ 80.6 $ 79.7
TAIWAN, PROVINCE OF CHINA      
Segment sales 30.0 32.3 32.1
BELGIUM      
Segment sales 21.0 13.4 6.8
INDONESIA      
Segment sales 12.1 8.3 9.0
CHINA      
Segment sales 8.5 9.4 9.0
JAPAN      
Segment sales 7.4 6.4 8.5
All Other Countries [Member]      
Segment sales $ 13.0 $ 17.0 $ 18.4