Note 11 - Business Segment Reporting - Sales by Geographic Area (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Nov. 27, 2016	Nov. 29, 2015	Nov. 27, 2016	Nov. 29, 2015
CANADA
Segment sales	$ 16.3	$ 20.0	$ 34.0	$ 40.4
TAIWAN, PROVINCE OF CHINA
Segment sales	11.1	12.4	24.9	25.4
CHINA
Segment sales	6.3	3.3	11.4	7.3
INDONESIA
Segment sales	3.6	2.5	5.1	3.9
JAPAN
Segment sales	2.9	1.6	4.9	3.6
BELGIUM
Segment sales	1.6	0.2	6.9	1.0
PHILIPPINES
Segment sales	0.7	0.6	1.3	1.5
All Other Countries [Member]
Segment sales	$ 3.5	$ 3.4	$ 5.7	$ 7.1