Note 12 - Goodwill and Other Assets - Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets, Gross	$ 34,000
Finite-Lived Intangible Assets, Accumulated Amortization	(10,634)
Finite-Lived Intangible Assets, Net	23,366	$ 24,518
Trade Names [Member]
Finite-Lived Intangible Assets, Gross	4,400
Finite-Lived Intangible Assets, Accumulated Amortization	(2,770)
Finite-Lived Intangible Assets, Net	$ 1,630
Finite-Lived Intangible Asset, Useful Life (Month)	6 months
Trade Names [Member] | Dedicated [Member]
Finite-Lived Intangible Assets, Gross	$ 2,402
Finite-Lived Intangible Assets, Accumulated Amortization	(1,512)
Finite-Lived Intangible Assets, Net	890
Trade Names [Member] | Managed Freight [Member]
Finite-Lived Intangible Assets, Gross	999
Finite-Lived Intangible Assets, Accumulated Amortization	(629)
Finite-Lived Intangible Assets, Net	370
Trade Names [Member] | Warehousing [Member]
Finite-Lived Intangible Assets, Gross	999
Finite-Lived Intangible Assets, Accumulated Amortization	(629)
Finite-Lived Intangible Assets, Net	370
Noncompete Agreements [Member]
Finite-Lived Intangible Assets, Gross	1,400
Finite-Lived Intangible Assets, Accumulated Amortization	(1,400)
Finite-Lived Intangible Assets, Net	0
Noncompete Agreements [Member] | Dedicated [Member]
Finite-Lived Intangible Assets, Gross	914
Finite-Lived Intangible Assets, Accumulated Amortization	(914)
Finite-Lived Intangible Assets, Net	0
Noncompete Agreements [Member] | Managed Freight [Member]
Finite-Lived Intangible Assets, Gross	130
Finite-Lived Intangible Assets, Accumulated Amortization	(130)
Finite-Lived Intangible Assets, Net	0
Noncompete Agreements [Member] | Warehousing [Member]
Finite-Lived Intangible Assets, Gross	356
Finite-Lived Intangible Assets, Accumulated Amortization	(356)
Finite-Lived Intangible Assets, Net	0
Customer Relationships [Member]
Finite-Lived Intangible Assets, Gross	28,200
Finite-Lived Intangible Assets, Accumulated Amortization	(6,464)
Finite-Lived Intangible Assets, Net	$ 21,736
Finite-Lived Intangible Asset, Useful Life (Month)	111 months
Customer Relationships [Member] | Dedicated [Member]
Finite-Lived Intangible Assets, Gross	$ 14,072
Finite-Lived Intangible Assets, Accumulated Amortization	(3,225)
Finite-Lived Intangible Assets, Net	10,847
Customer Relationships [Member] | Managed Freight [Member]
Finite-Lived Intangible Assets, Gross	1,692
Finite-Lived Intangible Assets, Accumulated Amortization	(389)
Finite-Lived Intangible Assets, Net	1,303
Customer Relationships [Member] | Warehousing [Member]
Finite-Lived Intangible Assets, Gross	12,436
Finite-Lived Intangible Assets, Accumulated Amortization	(2,850)
Finite-Lived Intangible Assets, Net	$ 9,586