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Note 9 - Business Segment Reporting - Sales by Geographic Area (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Nov. 26, 2017
Nov. 27, 2016
Nov. 26, 2017
Nov. 27, 2016
CANADA        
Segment sales $ 17.5 $ 16.3 $ 35.7 $ 34.0
TAIWAN, PROVINCE OF CHINA        
Segment sales 7.5 11.1 11.3 24.9
BELGIUM        
Segment sales 0.5 1.6 2.7 6.9
CHINA        
Segment sales 1.1 6.3 1.3 11.4
INDONESIA        
Segment sales 2.6 3.6 3.8 5.1
JAPAN        
Segment sales 1.6 2.9 3.2 4.9
PHILIPPINES        
Segment sales 0.4 0.7 1.0 1.3
All Other Countries [Member]        
Segment sales $ 3.2 $ 3.5 $ 4.7 $ 5.7