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Note 7 - Employee Benefit Plans (Tables) | 12 Months Ended
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Aug. 31, 2013
Compensation and Retirement Disclosure [Abstract] |
Schedule of Net Benefit Costs [Table Text Block] |
|  | Pension Plans |  |  | SERP |
|  | 2013 |  |  | 2012 |  |  | 2011 |  |  | 2013 |  |  | 2012 |  |  | 2011 |
Service cost |  | $ | 178 |  |  | $ | 152 |  |  | $ | 149 |  |  | $ | 547 |  |  | $ | 512 |  |  | $ | 486 |
Interest cost |  |  | 268 |  |  |  | 322 |  |  |  | 328 |  |  |  | 912 |  |  |  | 858 |  |  |  | 764 |
Expected return on assets |  |  | (198 | ) |  |  | (199 | ) |  |  | (202 | ) |  |  | — |  |  |  | — |  |  |  | — |
Amortization of prior service cost |  |  | 62 |  |  |  | 62 |  |  |  | 62 |  |  |  | 368 |  |  |  | 368 |  |  |  | 368 |
Amortization of unrecognized loss |  |  | 138 |  |  |  | 65 |  |  |  | 78 |  |  |  | 104 |  |  |  | 107 |  |  |  | 131 |
Other events |  |  | 44 |  |  |  | 43 |  |  |  | 65 |  |  |  | — |  |  |  | — |  |  |  | — |
Net periodic benefit cost |  | $ | 492 |  |  | $ | 445 |  |  | $ | 480 |  |  | $ | 1,931 |  |  | $ | 1,845 |  |  | $ | 1,749 |
Obligations And Funded Status Related To Pension Plans And Serp [Table Text Block] |
|  | Pension Plans |  |  | SERP |
|  | 2013 |  |  | 2012 |  |  | 2013 |  |  | 2012 |
Change in benefit obligation: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Projected benefit obligation, beginning of year |  | $ | 8,301 |  |  | $ | 7,372 |  |  | $ | 16,399 |  |  | $ | 14,944 |
Service cost |  |  | 178 |  |  |  | 152 |  |  |  | 547 |  |  |  | 512 |
Interest cost |  |  | 268 |  |  |  | 322 |  |  |  | 912 |  |  |  | 858 |
Actuarial (gain) loss |  |  | (379 | ) |  |  | 937 |  |  |  | 827 |  |  |  | 622 |
Benefits paid |  |  | (259 | ) |  |  | (299 | ) |  |  | (575 | ) |  |  | (537 | )
Settlements |  |  | (155 | ) |  |  | (183 | ) |  |  | — |  |  |  | — |
Projected benefit obligation, end of year |  | $ | 7,954 |  |  | $ | 8,301 |  |  | $ | 18,110 |  |  | $ | 16,399 |
Change in plan assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of plan assets, beginning of year |  | $ | 5,114 |  |  | $ | 5,145 |  |  | $ | — |  |  | $ | — |
Actual return on plan assets |  |  | 33 |  |  |  | 202 |  |  |  | — |  |  |  | — |
Employer contributions |  |  | 206 |  |  |  | 249 |  |  |  | — |  |  |  | — |
Benefits paid |  |  | (259 | ) |  |  | (299 | ) |  |  | — |  |  |  | — |
Settlements |  |  | (155 | ) |  |  | (183 | ) |  |  | — |  |  |  | — |
Fair value of plan assets, end of year |  | $ | 4,939 |  |  | $ | 5,114 |  |  | $ | — |  |  | $ | — |
Funded status (net amount recognized): |  | $ | (3,015 | ) |  | $ | (3,187 | ) |  | $ | (18,110 | ) |  | $ | (16,399 | )
Schedule of Amounts Recognized in Balance Sheet [Table Text Block] |
|  | Pension Plans |  |  | SERP |
|  | 2013 |  |  | 2012 |  |  | 2013 |  |  | 2012 |
Deferred tax assets |  | $ | 913 |  |  | $ | 1,089 |  |  | $ | 1,665 |  |  | $ | 1,648 |
Accrued liabilities |  | $ | 3,015 |  |  | $ | 3,187 |  |  | $ | 18,110 |  |  | $ | 16,399 |
Accumulated other comprehensive loss |  | $ | (1,458 | ) |  | $ | (1,740 | ) |  | $ | (2,660 | ) |  | $ | (2,633 | )
Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block] |
|  | Pension Plans |  |  | SERP |
|  | 2013 |  |  | 2012 |  |  | 2013 |  |  | 2012 |
Net actuarial loss |  | $ | (1,201 | ) |  | $ | (1,445 | ) |  | $ | (1,947 | ) |  | $ | (1,694 | )
Unrecognized prior service cost |  |  | (257 | ) |  |  | (295 | ) |  |  | (713 | ) |  |  | (939 | )
|  | $ | (1,458 | ) |  | $ | (1,740 | ) |  | $ | (2,660 | ) |  | $ | (2,633 | )
Schedule of Assumptions Used [Table Text Block] |
|  | Pension Plans |  |  | SERP |
|  | 2013 |  |  | 2012 |  |  | 2013 |  |  | 2012 |
Discount rate |  |  | 4.3 | % |  |  | 3.3 | % |  |  | 4.6 | % |  |  | 3.6 | %
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 |
|  | 2013 |  |  | 2012 |  |  | 2011 |  |  | 2013 |  |  | 2012 |  |  | 2011 |
Discount rate |  |  | 3.3 | % |  |  | 4.6 | % |  |  | 4.7 | % |  |  | 3.6 | % |  |  | 4.9 | % |  |  | 4.8 | %
Expected return on plan assets |  |  | 3.9 | % |  |  | 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 |
2014 |  | $ | 752 |  |  | $ | 655 |
2015 |  |  | 504 |  |  |  | 734 |
2016 |  |  | 337 |  |  |  | 898 |
2017 |  |  | 469 |  |  |  | 906 |
2018 |  |  | 412 |  |  |  | 929 |
Thereafter |  |  | 5,480 |  |  |  | 13,988 |
|  | $ | 7,954 |  |  | $ | 18,110 |

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- Definition Tabular disclosure of the amounts that are recognized in the balance sheet (or statement of financial position) for pension plans and/or other employee benefit plans, showing separately the assets and current and noncurrent liabilities (if applicable) recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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