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Note 7 - Amounts Recognized in Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
Aug. 27, 2016
Aug. 29, 2015
Pension Plan [Member]    
Net actuarial loss $ (1,497) $ (1,199)
Unrecognized prior service cost (291) (339)
Accumulated other comprehensive loss (1,788) (1,538)
Supplemental Executive Retirement Plan [Member]    
Net actuarial loss (6,429) (2,918)
Unrecognized prior service cost (34) (263)
Accumulated other comprehensive loss $ (6,463) $ (3,181)