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Note 5 - Property and Equipment - Property and Equipment, at Cost (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
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

X

- 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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X

- 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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