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Note 3 - Segment Information (Details Textual) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($)
Number of Reportable Segments |  |  | 2 |
Revenue from Contract with Customer, Including Assessed Tax | $ 243,303 | $ 178,631 | $ 613,187 | $ 501,701
Managed Freight [Member] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | $ 46,250 | $ 25,565 | 90,875 | $ 55,379
Accounts Receivable Factoring Business [Member] | Managed Freight [Member] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  | 3,400 |
Warehousing Business [Member] | Managed Freight [Member] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  | $ 11,700 |

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- Definition Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045 + Details
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