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Note 5 - Property and Equipment - Property and Equipment, at Cost (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Property, plant, and equipment, gross | $ 692,532 | $ 619,686
Revenue Equipment [Member] |  |
Property, plant, and equipment, gross | 538,617 | 468,527
Office Equipment [Member] |  |
Property, plant, and equipment, gross | 5,847 | 4,470
Land and Land Improvements [Member] |  |
Property, plant, and equipment, gross | 11,747 | 11,719
Building and Building Improvements [Member] |  |
Property, plant, and equipment, gross | 104,358 | 96,550
Construction in Progress [Member] |  |
Property, plant, and equipment, gross | 2,968 | 16,077
Property, Plant and Equipment, Other Types [Member] |  |
Property, plant, and equipment, gross | $ 28,995 | $ 22,343
Minimum [Member] | Revenue Equipment [Member] |  |
Estimated useful lives (Year) | 2 years |
Minimum [Member] | Office Equipment [Member] |  |
Estimated useful lives (Year) | 5 years |
Minimum [Member] | Land and Land Improvements [Member] |  |
Estimated useful lives (Year) | 0 years |
Minimum [Member] | Building and Building Improvements [Member] |  |
Estimated useful lives (Year) | 7 years |
Minimum [Member] | Property, Plant and Equipment, Other Types [Member] |  |
Estimated useful lives (Year) | 2 years |
Maximum [Member] | Revenue Equipment [Member] |  |
Estimated useful lives (Year) | 20 years |
Maximum [Member] | Office Equipment [Member] |  |
Estimated useful lives (Year) | 10 years |
Maximum [Member] | Land and Land Improvements [Member] |  |
Estimated useful lives (Year) | 15 years |
Maximum [Member] | Building and Building Improvements [Member] |  |
Estimated useful lives (Year) | 40 years |
Maximum [Member] | Property, Plant and Equipment, Other Types [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://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(8)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 360 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482099/360-10-50-1 + 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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