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Note 3 - Revenue and Business Segments (Details Textual) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Number of Operating Segments | 5 |  |
Number of Reportable Segments | 4 |  |
Customer Contract Term | 1 year |  |
Capitalized Contract Cost, Impairment Loss | $ 0 |  |
Dedicated [Member] |  |  |
Depreciation, Depletion and Amortization, Total | $ 29,600 | $ 22,000 | $ 20,600
Dedicated [Member] | Minimum [Member] |  |  |
Customer Contract Term | 3 years |  |
Dedicated [Member] | Maximum [Member] |  |  |
Customer Contract Term | 5 years |  |
Truckload [Member] |  |  |
Depreciation, Depletion and Amortization, Total | $ 52,200 | 57,200 | 56,200
Intermodal [Member] |  |  |
Depreciation, Depletion and Amortization, Total | 5,500 | 4,600 | 3,900
Brokerage [Member] |  |  |
Depreciation, Depletion and Amortization, Total | $ 1,300 | $ 1,300 | $ 1,700

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