Note 9 - Business Segment Reporting (Details Textual)	3 Months Ended	6 Months Ended
	Aug. 26, 2018	Nov. 25, 2018	Nov. 26, 2017
Number of Operating Segments	3	3
Sales Revenue, Net [Member] | Customer Concentration Risk [Member]
Entity Wide Revenue Major Customer Number		5	5
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Natural Foods [Member]
Entity Wide Revenue Major Customer Number		2	2
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Top Five Customers [Member]
Concentration Risk, Percentage		45.00%	49.00%
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Costco [Member] | Natural Foods [Member]
Concentration Risk, Percentage		17.00%	19.00%
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Wal-mart [Member] | Natural Foods [Member]
Concentration Risk, Percentage		17.00%	18.00%