Note 14 - Business Segment Reporting (Details) - Sales by Geograhic Area (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Aug. 25, 2013	Aug. 26, 2012
Note 14 - Business Segment Reporting (Details) - Sales by Geograhic Area [Line Items]
Segment sales	$ 109,479	$ 102,074
Taiwan [Member]
Note 14 - Business Segment Reporting (Details) - Sales by Geograhic Area [Line Items]
Segment sales	12,000	12,900
Canada [Member]
Note 14 - Business Segment Reporting (Details) - Sales by Geograhic Area [Line Items]
Segment sales	9,400	6,200
Japan [Member]
Note 14 - Business Segment Reporting (Details) - Sales by Geograhic Area [Line Items]
Segment sales	3,200	3,100
Indonesia [Member]
Note 14 - Business Segment Reporting (Details) - Sales by Geograhic Area [Line Items]
Segment sales	2,500	6,100
Belgium [Member]
Note 14 - Business Segment Reporting (Details) - Sales by Geograhic Area [Line Items]
Segment sales	1,200	3,000
All Other Countries [Member]
Note 14 - Business Segment Reporting (Details) - Sales by Geograhic Area [Line Items]
Segment sales	$ 6,900	$ 5,000