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Note 7 - Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2012
Schedule of Future Minimum Lease Payments [Table Text Block]
Year Ending December 31,
     
2013
  $ 17,188  
2014
    15,749  
2015
    14,317  
2016
    12,948  
2017
    10,666  
Thereafter
    72,968  
Total minimum lease payments
    143,836  
Less: sublease rentals
    (7,785 )
    $ 136,051  
Charge-Backs, Estimated Future Payments [Table Text Block]
Year Ending December 31,
     
2013
  $ 7,540  
2014
    3,792  
2015
    1,553  
2016
    491  
2017
    118  
Thereafter
    10  
Total
  $ 13,504  
Assumed Lifelime Oil Contracts [Member]
  
Schedule Of Deferred Revenue, Future Recognition [Table Text Block]
Year Ending December 31,
     
2013
  $ 1,090  
2014
    850  
2015
    654  
2016
    488  
2017
    349  
Thereafter
    559  
Total
  $ 3,990  
Self-insured Lifetime Oil Contracts [Member]
  
Schedule Of Deferred Revenue, Future Recognition [Table Text Block]
Year Ending December 31,
     
2013
  $ 8,448  
2014
    5,839  
2015
    4,541  
2016
    3,547  
2017
    2,827  
Thereafter
    8,721  
Total
  $ 33,923