Note 11 - Business Segment Reporting (Details)	3 Months Ended
	Aug. 31, 2014	Aug. 25, 2013
Note 11 - Business Segment Reporting (Details) [Line Items]
Number of Operating Segments	3
Customer 1 [Member] | Food Products Technology [Member] | Sales Revenue, Net [Member] | Customer Concentration Risk [Member]
Note 11 - Business Segment Reporting (Details) [Line Items]
Concentration Risk, Percentage	20.00%	20.00%
Customer 2 [Member] | Food Products Technology [Member] | Sales Revenue, Net [Member] | Customer Concentration Risk [Member]
Note 11 - Business Segment Reporting (Details) [Line Items]
Concentration Risk, Percentage	11.00%	12.00%
Food Products Technology [Member] | Sales Revenue, Net [Member] | Customer Concentration Risk [Member]
Note 11 - Business Segment Reporting (Details) [Line Items]
Entity-Wide Revenue Major Customer Number	2	2
Sales Revenue, Net [Member] | Customer Concentration Risk [Member]
Note 11 - Business Segment Reporting (Details) [Line Items]
Entity-Wide Revenue Major Customer Number	5	5
Concentration Risk, Percentage	46.00%	44.00%