Note 14 - Business Segment Reporting (Details) - Sales by Geograhic Area (USD $) In Millions, unless otherwise specified	12 Months Ended
	May 25, 2014	May 26, 2013	May 27, 2012
CANADA
Note 14 - Business Segment Reporting (Details) - Sales by Geograhic Area [Line Items]
Segment sales	$ 46.6	$ 27.8	$ 20.8
TAIWAN, PROVINCE OF CHINA
Note 14 - Business Segment Reporting (Details) - Sales by Geograhic Area [Line Items]
Segment sales	30.7	31.0	22.7
BELGIUM
Note 14 - Business Segment Reporting (Details) - Sales by Geograhic Area [Line Items]
Segment sales	13.1	16.6	15.6
JAPAN
Note 14 - Business Segment Reporting (Details) - Sales by Geograhic Area [Line Items]
Segment sales	9.9	10.6	11.1
INDONESIA
Note 14 - Business Segment Reporting (Details) - Sales by Geograhic Area [Line Items]
Segment sales	9.6	21.0	23.0
CHINA
Note 14 - Business Segment Reporting (Details) - Sales by Geograhic Area [Line Items]
Segment sales	8.2	5.0	4.3
All Other Countries [Member]
Note 14 - Business Segment Reporting (Details) - Sales by Geograhic Area [Line Items]
Segment sales	$ 19.1	$ 20.8	$ 17.0