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Note 10 - Revenue and Business Segments (Details Textual)	3 Months Ended		9 Months Ended
	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Dec. 31, 2023 USD ($)
Number of Operating Segments			5
Number of Reportable Segments			4
Customer Contract Term (Year)			1 year
Capitalized Contract Cost, Impairment Loss			$ 0	$ 0
Prepaid Expenses and Other Current Assets [Member]
Contract with Customer, Asset, after Allowance for Credit Loss, Total	$ 2,400,000		2,400,000		$ 2,100,000
Dedicated [Member]
Depreciation, Depletion and Amortization, Total	9,500,000	$ 11,500,000	$ 29,800,000	35,200,000
Dedicated [Member] | Minimum [Member]
Customer Contract Term (Year)			3 years
Dedicated [Member] | Maximum [Member]
Customer Contract Term (Year)			5 years
Truckload [Member]
Depreciation, Depletion and Amortization, Total	15,800,000	15,300,000	$ 48,100,000	45,900,000
Intermodal [Member]
Depreciation, Depletion and Amortization, Total	1,500,000	1,700,000	4,600,000	5,500,000
Brokerage [Member]
Depreciation, Depletion and Amortization, Total	$ 527,000	$ 462,000	$ 1,600,000	$ 1,400,000

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Amount of impairment loss for asset recognized from cost incurred to obtain or fulfill contract with customer.

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