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Note 7 - Employee Benefit Plans (Details) - Obligations and Funded Status Related to Its Pension Plans and SERP - USD ($)
$ in Thousands
12 Months Ended
Aug. 29, 2015
Aug. 30, 2014
Aug. 31, 2013
Change in plan assets:      
Fair value of plan assets $ 5,008    
Fair value of plan assets 4,757 $ 5,008  
Pension Plan [Member]      
Change in benefit obligation:      
Projected benefit obligation 8,755 7,954  
Change in plan assets:      
Fair value of plan assets 5,008 4,939  
Funded status (net amount recognized): (3,722) (3,747)  
Actual return on plan assets 153 154  
Employer contributions 394 322  
Service cost 192 172 $ 178
Interest cost 294 328 268
Amendments 263    
Actuarial (gain) loss (228) 708  
Benefits paid (314) (198)  
Settlements (484) (209)  
Settlements (483) (209)  
Projected benefit obligation 8,479 8,755 7,954
Fair value of plan assets 4,757 5,008 4,939
Supplemental Executive Retirement Plan [Member]      
Change in benefit obligation:      
Projected benefit obligation 21,284 18,110  
Change in plan assets:      
Funded status (net amount recognized): (23,285) (21,284)  
Service cost 821 615 547
Interest cost 1,133 942 912
Actuarial (gain) loss 290 1,889  
Benefits paid (243) (272)  
Projected benefit obligation $ 23,285 $ 21,284 $ 18,110