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Note 4 - Property and Equipment - Property and Equipment, at Cost (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Property, plant, and equipment, gross | $ 638,770 | $ 650,988
Revenue Equipment [Member] |  |
Property, plant, and equipment, gross | $ 504,192 | 519,797
Revenue Equipment [Member] | Minimum [Member] |  |
Estimated useful lives (Year) | 3 years |
Revenue Equipment [Member] | Maximum [Member] |  |
Estimated useful lives (Year) | 10 years |
Office Equipment [Member] |  |
Property, plant, and equipment, gross | $ 3,850 | 4,585
Office Equipment [Member] | Minimum [Member] |  |
Estimated useful lives (Year) | 5 years |
Office Equipment [Member] | Maximum [Member] |  |
Estimated useful lives (Year) | 10 years |
Land and Land Improvements [Member] |  |
Property, plant, and equipment, gross | $ 25,240 | 25,061
Land and Land Improvements [Member] | Minimum [Member] |  |
Estimated useful lives (Year) | 0 years |
Land and Land Improvements [Member] | Maximum [Member] |  |
Estimated useful lives (Year) | 15 years |
Building and Building Improvements [Member] |  |
Property, plant, and equipment, gross | $ 75,134 | 74,513
Building and Building Improvements [Member] | Minimum [Member] |  |
Estimated useful lives (Year) | 7 years |
Building and Building Improvements [Member] | Maximum [Member] |  |
Estimated useful lives (Year) | 40 years |
Construction in Progress [Member] |  |
Property, plant, and equipment, gross | $ 3,121 | 2,023
Property, Plant and Equipment, Other Types [Member] |  |
Property, plant, and equipment, gross | $ 27,233 | $ 25,009
Property, Plant and Equipment, Other Types [Member] | Minimum [Member] |  |
Estimated useful lives (Year) | 2 years |
Property, Plant and Equipment, Other Types [Member] | Maximum [Member] |  |
Estimated useful lives (Year) | 10 years |

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- Definition Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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