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Note 16 - Segment Information (Details Textual) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 USD ($) | [1] | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | [1] | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Number of Reportable Segments |  |  |  |  |  |  |  |  | 2 |  |
Revenues, Total | $ 272,268 | $ 243,303 | $ 196,318 | $ 173,566 | $ 203,306 | $ 178,631 | $ 164,326 | $ 158,744 |  |  |
Managed Freight [Member] | Tractors and Warehouse Space [Member] |  |  |  |  |  |  |  |  |  |  |
Operating Leases, Income Statement, Lease Revenue, Total |  |  |  |  |  |  |  |  | $ 900 |  |
Managed Freight [Member] | Factoring [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues, Total |  |  |  |  |  |  |  |  | 5,000 | $ 3,100 | $ 2,600
Managed Freight [Member] | Warehouse [Member] | Landair [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues, Total |  |  |  |  |  |  |  |  | 23,600 |  |
Truckload [Member] | Tractors and Warehouse Space [Member] |  |  |  |  |  |  |  |  |  |  |
Operating Leases, Income Statement, Lease Revenue, Total |  |  |  |  |  |  |  |  | $ 3,900 |  |
[1] | Includes $40.1 million one-time benefit related to the Tax Act.

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