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Note 3 - Restructuring and Cost Savings Initiatives - Summary of Asset Groups Impaired (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Impairment of long lived property, equipment, and right-of-use assets | $ 26,569 | $ 0 | $ 0
Revenue Equipment [Member] | Highway Services and Dedicated [Member] |  |  |
Impairment of long lived property, equipment, and right-of-use assets | 16,779 |  |
Terminal Property [Member] | Highway Services and Dedicated [Member] |  |  |
Impairment of long lived property, equipment, and right-of-use assets | 7,319 |  |
Leased Office Facility [Member] |  |  |
Impairment of long lived property, equipment, and right-of-use assets | 2,200 |  |
Leased Office Facility [Member] | Managed Freight [Member] |  |  |
Impairment of long lived property, equipment, and right-of-use assets | 2,236 |  |
Training and Orientation Center [Member] | Highway Services [Member] |  |  |
Impairment of long lived property, equipment, and right-of-use assets | $ 235 |  |

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- Definition The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for abandonment, exchange or sale. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2611-110228 + Details
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