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Note 10 - Business Segments
 9 Months Ended
Sep. 30, 2012
Segment Reporting Disclosure [Text Block]
(10) Business Segments

We have six operating segments that have been aggregated into two reporting segments (Truckload and Logistics) for financial reporting purposes.  The primary source of our operating revenue is truckload revenue, which we generate by transporting freight for our customers and report within our Truckload segment.  Generally, we are paid by the mile for our services.  We also derive truckload revenue from fuel surcharges, loading and unloading activities, equipment detention and other ancillary services.

Our operating revenue also includes revenue reported within our Logistics segment, which consists of revenue from our internal brokerage and intermodal operations, and through our 45% interest in MWL, a third-party provider of logistics services to the transportation industry.  Brokerage services involve arranging for another company to transport freight for our customers while we retain the billing, collection and customer management responsibilities.  Intermodal services involve the transport of our trailers on railroad flatcars for a portion of a trip, with the balance of the trip using our tractors or, to a lesser extent, contracted carriers.

The following table sets forth for the periods indicated our operating revenue and operating income by segment.  We do not prepare separate balance sheets by segment and, as a result, assets are not separately identifiable by segment.

   
Three Months
Ended September 30,
   
Nine Months
Ended September 30,
 
(Dollars in thousands)
 
2012
    2011    
2012
    2011  
                         
Operating revenue:
                       
Truckload revenue, net of fuel surcharge revenue
  $ 96,938     $ 92,003     $ 280,284     $ 263,613  
Truckload fuel surcharge revenue
    25,931       24,849       77,305       72,463  
Total Truckload revenue
    122,869       116,852       357,589       336,076  
Logistics revenue, net of intermodal fuel surcharge revenue(1)
    36,408       35,500       102,889       98,221  
Intermodal fuel surcharge revenue
    4,329       3,996       11,566       11,042  
Total Logistics revenue
    40,737       39,496       114,455       109,263  
Total operating revenue
  $ 163,606     $ 156,348     $ 472,044     $ 445,339  
Operating income:
                               
Truckload
  $ 7,938     $ 9,174     $ 26,039     $ 24,097  
Logistics
    1,902       1,937       6,603       5,982  
Total operating income
  $ 9,840     $ 11,111     $ 32,642     $ 30,079  

(1)   Logistics revenue is net of $2.3 million and $7.2 million of inter-segment revenue in the three-month and nine-month periods ended September 30, 2012, respectively, for loads transported by our tractors and arranged by MWL that ha ve been eliminated in consolidation.  Inter-segment revenue was $2.3 million and $6.7 million for the three-month and nine-month periods ended September 30, 2011.

Truckload segment depreciation expense was $14.3 million and $14.0 million, and Logistics segment depreciation expense was $1.2 million and $778,000, in the three-month periods ended September 30, 2012 and September 30, 2011, respectively. Truckload segment depreciation expense was $42.0 million and $40.1 million, and Logistics segment depreciation expense was $3.1 million and $2.3 million, in the first nine months of 2012 and 2011, respectively.