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Note 6 - Employee Benefit Plans (Tables) | 12 Months Ended
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Aug. 30, 2014
Compensation and Retirement Disclosure [Abstract] |
Schedule of Net Benefit Costs [Table Text Block] |
|  | Pension Plans |  |  | SERP |
|  | 2014 |  |  | 2013 |  |  | 2012 |  |  | 2014 |  |  | 2013 |  |  | 2012 |
Service cost |  | $ | 172 |  |  | $ | 178 |  |  | $ | 152 |  |  | $ | 615 |  |  | $ | 547 |  |  | $ | 512 |
Interest cost |  |  | 328 |  |  |  | 268 |  |  |  | 322 |  |  |  | 942 |  |  |  | 912 |  |  |  | 858 |
Expected return on assets |  |  | (183 | ) |  |  | (198 | ) |  |  | (199 | ) |  |  | — |  |  |  | — |  |  |  | — |
Amortization of prior service cost |  |  | 62 |  |  |  | 62 |  |  |  | 62 |  |  |  | 368 |  |  |  | 368 |  |  |  | 368 |
Amortization of unrecognized loss |  |  | 113 |  |  |  | 138 |  |  |  | 65 |  |  |  | 151 |  |  |  | 104 |  |  |  | 107 |
Other events |  |  | 72 |  |  |  | 44 |  |  |  | 43 |  |  |  | — |  |  |  | — |  |  |  | — |
Net periodic benefit cost |  | $ | 564 |  |  | $ | 492 |  |  | $ | 445 |  |  | $ | 2,076 |  |  | $ | 1,931 |  |  | $ | 1,845 |
Changes in Projected Benefit Obligations, Fair Value of Plan Assets, and Funded Status of Plan [Table Text Block] |
|  | Pension Plans |  |  | SERP |
|  | 2014 |  |  | 2013 |  |  | 2014 |  |  | 2013 |
Change in benefit obligation: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Projected benefit obligation, beginning of year |  | $ | 7,954 |  |  | $ | 8,301 |  |  | $ | 18,110 |  |  | $ | 16,399 |
Service cost |  |  | 172 |  |  |  | 178 |  |  |  | 615 |  |  |  | 547 |
Interest cost |  |  | 328 |  |  |  | 268 |  |  |  | 942 |  |  |  | 912 |
Actuarial (gain) loss |  |  | 708 |  |  |  | (379 | ) |  |  | 2,272 |  |  |  | 827 |
Benefits paid |  |  | (198 | ) |  |  | (259 | ) |  |  | (655 | ) |  |  | (575 | )
Settlements |  |  | (209 | ) |  |  | (155 | ) |  |  | — |  |  |  | — |
Projected benefit obligation, end of year |  | $ | 8,755 |  |  | $ | 7,954 |  |  | $ | 21,284 |  |  | $ | 18,110 |
Change in plan assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of plan assets, beginning of year |  | $ | 4,939 |  |  | $ | 5,114 |  |  | $ | — |  |  | $ | — |
Actual return on plan assets |  |  | 154 |  |  |  | 33 |  |  |  | — |  |  |  | — |
Employer contributions |  |  | 322 |  |  |  | 206 |  |  |  | — |  |  |  | — |
Benefits paid |  |  | (198 | ) |  |  | (259 | ) |  |  | — |  |  |  | — |
Settlements |  |  | (209 | ) |  |  | (155 | ) |  |  | — |  |  |  | — |
Fair value of plan assets, end of year |  | $ | 5,008 |  |  | $ | 4,939 |  |  | $ | — |  |  | $ | — |
Funded status (net amount recognized): |  | $ | (3,747 | ) |  | $ | (3,015 | ) |  | $ | (21,284 | ) |  | $ | (18,110 | )
Schedule of Amounts Recognized in Balance Sheet [Table Text Block] |
|  | Pension Plans |  |  | SERP |
|  | 2014 |  |  | 2013 |  |  | 2014 |  |  | 2013 |
Deferred tax assets |  | $ | 1,097 |  |  | $ | 913 |  |  | $ | 2,193 |  |  | $ | 1,665 |
Accrued liabilities |  | $ | 3,747 |  |  | $ | 3,015 |  |  | $ | 21,284 |  |  | $ | 18,110 |
Accumulated other comprehensive loss |  | $ | (1,753 | ) |  | $ | (1,458 | ) |  | $ | (3,503 | ) |  | $ | (2,660 | )
Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block] |
|  | Pension Plans |  |  | SERP |
|  | 2014 |  |  | 2013 |  |  | 2014 |  |  | 2013 |
Net actuarial loss |  | $ | (1,534 | ) |  | $ | (1,201 | ) |  | $ | (3,016 | ) |  | $ | (1,947 | )
Unrecognized prior service cost |  |  | (219 | ) |  |  | (257 | ) |  |  | (487 | ) |  |  | (713 | )
|  | $ | (1,753 | ) |  | $ | (1,458 | ) |  | $ | (3,503 | ) |  | $ | (2,660 | )
Schedule of Assumptions Used [Table Text Block] |
|  | Pension Plans |  |  | SERP |
|  | 2014 |  |  | 2013 |  |  | 2014 |  |  | 2013 |
Discount rate |  |  | 3.6 | % |  |  | 4.3 | % |  |  | 3.8 | % |  |  | 4.6 | %
Rate of compensation increase |  | N/A |  |  | N/A |  |  |  | 5.0 | % |  |  | 5.0 | %
Schedule of Assumptions Used in Calculating Net Periodic Service Cost [Table Text Block] |
|  | Pension Plans |  |  | SERP |
|  | 2014 |  |  | 2013 |  |  | 2012 |  |  | 2014 |  |  | 2013 |  |  | 2012 |
Discount rate |  |  | 4.3 | % |  |  | 3.3 | % |  |  | 4.6 | % |  |  | 4.6 | % |  |  | 3.6 | % |  |  | 4.9 | %
Expected return on plan assets |  |  | 4.0 | % |  |  | 4.0 | % |  |  | 4.0 | % |  | N/A |  |  | N/A |  |  | N/A |
Rate of compensation increase |  | N/A |  |  | N/A |  |  | N/A |  |  |  | 5.0 | % |  |  | 5.0 | % |  |  | 5.0 | %
Schedule of Expected Benefit Payments [Table Text Block] |
|  | Pension Plans |  |  | SERP |
2015 |  | $ | 510 |  |  | $ | 761 |
2016 |  |  | 398 |  |  |  | 929 |
2017 |  |  | 383 |  |  |  | 936 |
2018 |  |  | 290 |  |  |  | 960 |
2019 |  |  | 639 |  |  |  | 1,015 |
Thereafter |  |  | 6,535 |  |  |  | 16,683 |
|  | $ | 8,755 |  |  | $ | 21,284 |

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