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Note 7 - Employee Benefit Plans (Details) - Expected Benefit Payments - USD ($)
$ in Thousands
Aug. 29, 2015
Aug. 30, 2014
Aug. 31, 2013
Pension Plan [Member]      
Note 7 - Employee Benefit Plans (Details) - Expected Benefit Payments [Line Items]      
2016 $ 459    
2017 307    
2018 423    
2019 818    
2020 622    
Thereafter 5,850    
8,479 $ 8,755 $ 7,954
Supplemental Executive Retirement Plan [Member]      
Note 7 - Employee Benefit Plans (Details) - Expected Benefit Payments [Line Items]      
2016 875    
2017 879    
2018 898    
2019 950    
2020 1,013    
Thereafter 18,670    
$ 23,285 $ 21,284 $ 18,110