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Note 1 - Significant Accounting Policies (Details Textual) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($)
Number of Reportable Segments |  |  |  | 2 |
Number of Asset-based Operating Fleets Aggregated in a Segment |  |  |  | 4 |
Revenue from Contract with Customer, Including Assessed Tax | $ 243,303 |  | $ 178,631 | $ 613,187 | $ 501,701
Tractors [Member] |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  |  | 5 years |
Property, Plant and Equipment, Salvage Value, Percentage | 15.00% |  |  | 15.00% |
Refrigerated Trailers [Member] |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  |  | 7 years |
Dry Van Trailers [Member] |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  |  | 10 years |
Property, Plant and Equipment, Salvage Value, Percentage | 25.00% |  |  | 25.00% |
Managed Freight [Member] |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | $ 46,250 |  | $ 25,565 | $ 90,875 | $ 55,379
Managed Freight [Member] | Accounts Receivable Factoring Business [Member] |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  |  | 3,400 |
Managed Freight [Member] | Warehousing Business [Member] |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  |  | $ 11,700 |
Accounting Standards Update 2014-09 [Member] |  |  |  |  |
Cumulative Effect on Retained Earnings, Net of Tax, Total |  | $ 600 |  |  |

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