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Note 11 - Business Segment Reporting - Sales by Geographic Area (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
May 27, 2018
Feb. 25, 2018
Nov. 26, 2017
Aug. 27, 2017
May 28, 2017
Feb. 26, 2017
Nov. 27, 2016
Aug. 28, 2016
May 27, 2018
May 28, 2017
May 29, 2016
Revenues $ 141,076 $ 144,909 $ 122,461 $ 115,781 $ 121,265 $ 129,292 $ 110,164 $ 109,055 $ 524,227 $ 469,776 $ 476,918
CANADA                      
Revenues                 78,000 69,300 80,600
BELGIUM                      
Revenues                 17,200 21,000 13,400
IRELAND                      
Revenues                 4,100 4,000 3,200
UNITED KINGDOM                      
Revenues                 800 400 600
SWITZERLAND                      
Revenues                 800 300 400
MEXICO                      
Revenues                 600 500 800
All Other Countries [Member]                      
Revenues                 $ 1,400 $ 3,400 $ 4,200