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Note 1 - Summary of Significant Accounting Policies - Segment By Operating Fleet Revenue (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Total revenue | $ 885,455 | $ 705,007 | $ 670,651
Truckload [Member] |  |  |
Total revenue | 727,046 | 612,834 | 601,226
Truckload [Member] | Expedited [Member] |  |  |
Total revenue | 334,118 | 332,930 | 370,689
Truckload [Member] | Dedicated [Member] |  |  |
Total revenue | 247,877 | 144,845 | 60,154
Truckload [Member] | Refrigerated [Member] |  |  |
Total revenue | 135,189 | 135,059 | 170,383
Truckload [Member] | Over the Road [Member] |  |  |
Total revenue | 9,862 |  |
Managed Freight [Member] |  |  |
Total revenue | 158,409 | 92,173 | 69,425
Managed Freight [Member] | Brokerage [Member] |  |  |
Total revenue | 114,827 | 89,042 | 66,867
Managed Freight [Member] | Warehouse [Member] |  |  |
Total revenue | 16,480 |  |
Managed Freight [Member] | Transportation Management Services [Member] |  |  |
Total revenue | 14,940 |  |
Managed Freight [Member] | Shuttle and Switching [Member] |  |  |
Total revenue | 7,100 |  |
Managed Freight [Member] | Factoring [Member] |  |  |
Total revenue | $ 5,062 | $ 3,131 | $ 2,558

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