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Note 9 - Business Segment Reporting - Sales by Geographic Area (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Feb. 25, 2018
Feb. 26, 2017
Feb. 25, 2018
Feb. 26, 2017
CANADA        
Segment sales $ 20.3 $ 16.6 $ 56.0 $ 50.6
TAIWAN, PROVINCE OF CHINA        
Segment sales 1.4 3.0 12.7 27.9
BELGIUM        
Segment sales 11.5 12.9 14.3 19.8
JAPAN        
Segment sales 1.6 1.3 4.8 11.8
INDONESIA        
Segment sales 0.2 1.5 4.0 6.6
PHILIPPINES        
Segment sales 0.5 0.6 1.5 6.2
CHINA        
Segment sales 0.3 0.4 1.6 1.9
All Other Countries [Member]        
Segment sales $ 2.1 $ 2.8 $ 6.7 $ 8.5