Segment Reporting Disclosure [Text Block] | ( 12 We account for our revenue in accordance with FASB ASC 606, Revenue from Contracts with Customers four 606. We have strategically transitioned from a refrigerated long-haul carrier to a multifaceted business offering a network of refrigerated and dry truck-based transportation capabilities across our five The primary source of our operating revenue is provided by our Truckload segment through a combination of regional short-haul and medium-to-long-haul full-load transportation services. We transport food and other consumer packaged goods that require a temperature-controlled or insulated environment, along with dry freight, across the United States and into and out of Mexico and Canada. Our agreements with customers are typically for one Our Dedicated segment provides customized transportation solutions tailored to meet individual customers’ requirements, utilizing temperature-controlled trailers, dry vans and other specialized equipment within the United States. Our agreements with customers range from three five Generally, we are paid by the mile for our Truckload and Dedicated services. We also derive Truckload and Dedicated revenue from fuel surcharges, loading and unloading activities, equipment detention and other accessorial services. The main factors that affect our Truckload and Dedicated revenue are the rate per mile we receive from our customers, the percentage of miles for which we are compensated, the number of miles we generate with our equipment and changes in fuel prices. We monitor our revenue production primarily through average Truckload and Dedicated revenue, net of fuel surcharges, per tractor per week. We also analyze our average Truckload and Dedicated revenue, net of fuel surcharges, per total mile, non-revenue miles percentage, the miles per tractor we generate, our fuel surcharge revenue, our accessorial revenue and our other sources of operating revenue. Our Intermodal segment transports our customers’ freight within the United States utilizing our temperature-controlled trailers and, beginning in September 2019, Our Brokerage segment develops contractual relationships with and arranges for third 2007 Operating results of our MRTN de Mexico business which offers our customers door-to-door service between the United States and Mexico with our Mexican partner carriers is reported within our Truckload and Brokerage segments. Our customer agreements are typically for one three five 606, four four no four one June 30, 2021 December 31, 2020, first six 2021 2020. 30 We account for revenue of our Intermodal and Brokerage segments and revenue on freight transported by independent contractors within our Truckload and Dedicated segments on a gross basis because we are the principal service provider controlling the promised service before it is transferred to each customer. We are primarily responsible for fulfilling the promise to provide each specified service to each customer. We bear the primary risk of loss in the event of cargo claims by our customers. We also have complete control and discretion in establishing the price for each specified service. Accordingly, all such revenue billed to customers is classified as operating revenue and all corresponding payments to carriers for transportation services we arrange in connection with brokerage and intermodal activities and to independent contractor providers of revenue equipment are classified as purchased transportation expense within our consolidated condensed statements of operations. The following table sets forth for the periods indicated our operating revenue and operating income by segment. We do not not Three Months Six Months Ended June 30, Ended June 30, (In thousands) 2021 2020 2021 2020 Operating revenue: Truckload revenue, net of fuel surcharge revenue $ 83,633 $ 85,966 $ 167,552 $ 169,823 Truckload fuel surcharge revenue 12,308 8,234 23,304 19,509 Total Truckload revenue 95,941 94,200 190,856 189,332 Dedicated revenue, net of fuel surcharge revenue 67,227 67,076 134,129 131,235 Dedicated fuel surcharge revenue 12,894 8,351 24,229 19,229 Total Dedicated revenue 80,121 75,427 158,358 150,464 Intermodal revenue, net of fuel surcharge revenue 22,031 18,542 41,477 39,136 Intermodal fuel surcharge revenue 3,561 1,759 6,119 4,845 Total Intermodal revenue 25,592 20,301 47,596 43,981 Brokerage revenue 30,788 22,456 58,678 47,253 Total operating revenue $ 232,442 $ 212,384 $ 455,488 $ 431,030 Operating income: Truckload $ 13,197 $ 11,036 $ 24,612 $ 17,821 Dedicated 10,617 11,452 19,553 19,985 Intermodal 1,850 954 3,311 2,260 Brokerage 2,854 1,814 5,040 3,222 Total operating income $ 28,518 $ 25,256 $ 52,516 $ 43,288 Truckload segment depreciation expense was $12.9 million and $14.0 million, Dedicated segment depreciation expense was $10.7 million and $10.3 million, Intermodal segment depreciation expense was $1.6 million and $1.3 million, and Brokerage segment depreciation expense was $298,000 and $306,000 in the three June 30, 2021 2020, Truckload segment depreciation expense was $26.1 million and $27.8 million, Dedicated segment depreciation expense was $21.4 million and $20.2 million, Intermodal segment depreciation expense was $3.1 million and $2.7 million, and Brokerage segment depreciation expense was $580,000 and $667,000 in the six June 30, 2021 2020, |