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Note 7 - Employee Benefit Plans (Tables)
12 Months Ended
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