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Note 12 - Goodwill and Other Assets - Intangible Assets (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets, Gross	$ 34,000	$ 34,000
Finite-Lived Intangible Assets, Accumulated Amortization	(12,937)	(9,482)
Finite-Lived Intangible Assets, Net	21,063	24,518
Trade Names [Member]
Finite-Lived Intangible Assets, Gross	4,400	4,400
Finite-Lived Intangible Assets, Accumulated Amortization	(3,900)	(2,206)
Finite-Lived Intangible Assets, Net	500	$ 2,194
Finite-Lived Intangible Asset, Useful Life (Month)		9 months
Trade Names [Member] | Dedicated [Member]
Finite-Lived Intangible Assets, Gross	2,402	$ 2,402
Finite-Lived Intangible Assets, Accumulated Amortization	(2,130)	(1,204)
Finite-Lived Intangible Assets, Net	272	1,198
Trade Names [Member] | Managed Freight [Member]
Finite-Lived Intangible Assets, Gross	999	999
Finite-Lived Intangible Assets, Accumulated Amortization	(885)	(501)
Finite-Lived Intangible Assets, Net	114	498
Trade Names [Member] | Warehousing [Member]
Finite-Lived Intangible Assets, Gross	999	999
Finite-Lived Intangible Assets, Accumulated Amortization	(885)	(501)
Finite-Lived Intangible Assets, Net	114	498
Customer Relationships [Member]
Finite-Lived Intangible Assets, Gross	28,200	28,200
Finite-Lived Intangible Assets, Accumulated Amortization	(7,637)	(5,876)
Finite-Lived Intangible Assets, Net	$ 20,563	$ 22,324
Finite-Lived Intangible Asset, Useful Life (Month)	105 months	114 months
Customer Relationships [Member] | Dedicated [Member]
Finite-Lived Intangible Assets, Gross	$ 14,072	$ 14,072
Finite-Lived Intangible Assets, Accumulated Amortization	(3,811)	(2,931)
Finite-Lived Intangible Assets, Net	10,261	11,141
Customer Relationships [Member] | Managed Freight [Member]
Finite-Lived Intangible Assets, Gross	1,692	1,692
Finite-Lived Intangible Assets, Accumulated Amortization	(458)	(354)
Finite-Lived Intangible Assets, Net	1,234	1,338
Customer Relationships [Member] | Warehousing [Member]
Finite-Lived Intangible Assets, Gross	12,436	12,436
Finite-Lived Intangible Assets, Accumulated Amortization	(3,368)	(2,591)
Finite-Lived Intangible Assets, Net	$ 9,068	$ 9,845

X

- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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X

- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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- Definition

Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 928
-SubTopic 340
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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- Definition

Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 926
-SubTopic 20
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=120154696&loc=d3e54445-107959

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-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
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