Note 10 - Business Segment Reporting - Sales by Geographic Area (Details) - USD ($) $ in Millions	12 Months Ended
	May 29, 2016	May 31, 2015	May 25, 2014
CANADA
Segment sales	$ 80.6	$ 79.7	$ 46.6
TAIWAN, PROVINCE OF CHINA
Segment sales	32.3	32.1	30.7
BELGIUM
Segment sales	13.4	6.8	13.1
INDONESIA
Segment sales	9.4	9.0	9.6
CHINA
Segment sales	8.3	9.0	8.2
JAPAN
Segment sales	6.4	8.5	9.9
All Other Countries [Member]
Segment sales	$ 17.0	$ 18.4	$ 19.1