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Note 5 - Property and Equipment - Property and Equipment, at Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Property, plant, and equipment, gross	$ 650,988	$ 631,076
Revenue Equipment [Member]
Property, plant, and equipment, gross	$ 519,797	499,809
Revenue Equipment [Member] | Minimum [Member]
Property, Plant and Equipment, Useful Life	3 years
Revenue Equipment [Member] | Maximum [Member]
Property, Plant and Equipment, Useful Life	10 years
Office Equipment [Member]
Property, plant, and equipment, gross	$ 4,585	8,192
Office Equipment [Member] | Minimum [Member]
Property, Plant and Equipment, Useful Life	5 years
Office Equipment [Member] | Maximum [Member]
Property, Plant and Equipment, Useful Life	10 years
Land and Land Improvements [Member]
Property, plant, and equipment, gross	$ 25,061	24,979
Land and Land Improvements [Member] | Minimum [Member]
Property, Plant and Equipment, Useful Life	0 years
Land and Land Improvements [Member] | Maximum [Member]
Property, Plant and Equipment, Useful Life	10 years
Building and Building Improvements [Member]
Property, plant, and equipment, gross	$ 74,513	71,827
Building and Building Improvements [Member] | Minimum [Member]
Property, Plant and Equipment, Useful Life	7 years
Building and Building Improvements [Member] | Maximum [Member]
Property, Plant and Equipment, Useful Life	40 years
Construction in Progress [Member]
Property, plant, and equipment, gross	$ 2,023	3,176
Property, Plant and Equipment, Other Types [Member]
Property, plant, and equipment, gross	$ 25,009	$ 23,093
Property, Plant and Equipment, Other Types [Member] | Minimum [Member]
Property, Plant and Equipment, Useful Life	2 years
Property, Plant and Equipment, Other Types [Member] | Maximum [Member]
Property, Plant and Equipment, Useful Life	7 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/presentationRef
-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://www.xbrl.org/2003/role/presentationRef
-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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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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