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Note 5 - Property and Equipment - Property and Equipment, at Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Property, plant, and equipment, gross	$ 619,686	$ 518,406
Revenue Equipment [Member]
Property, plant, and equipment, gross	468,527	400,282
Office Equipment [Member]
Property, plant, and equipment, gross	4,470	4,257
Land and Land Improvements [Member]
Property, plant, and equipment, gross	11,719	16,341
Building and Building Improvements [Member]
Property, plant, and equipment, gross	96,550	72,180
Construction in Progress [Member]
Property, plant, and equipment, gross	16,077	866
Property, Plant and Equipment, Other Types [Member]
Property, plant, and equipment, gross	$ 22,343	$ 24,480
Minimum [Member] | Revenue Equipment [Member]
Estimated useful lives (Year)	3 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)	10 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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(13))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 2: 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 https://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

+ 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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