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Note 14 - Revenue and Business Segments (Details Textual) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 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 | 2,100 | 2,700 |
Dedicated [Member] |  |  |
Depreciation, Depletion and Amortization, Total | $ 46,200 | 45,600 | $ 43,000
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 | $ 61,600 | 56,400 | 52,100
Intermodal [Member] |  |  |
Depreciation, Depletion and Amortization, Total | 7,100 | 7,500 | 6,300
Brokerage [Member] |  |  |
Depreciation, Depletion and Amortization, Total | $ 1,900 | $ 1,500 | $ 1,200

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- Definition Amount of impairment loss for asset recognized from cost incurred to obtain or fulfill contract with customer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 340 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479483/340-40-50-3 + Details
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- Definition Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479837/606-10-45-3 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479837/606-10-45-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-8 + Details
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