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Note 17 - Revenue and Business Segments (Details Textual) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 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 | 1,500 | 1,700 |
Dedicated [Member] |  |  |
Depreciation, Depletion and Amortization, Total | $ 41,400 | 34,600 | $ 29,600
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 | $ 54,700 | 54,000 | 52,200
Intermodal [Member] |  |  |
Depreciation, Depletion and Amortization, Total | 5,600 | 5,100 | 5,500
Brokerage [Member] |  |  |
Depreciation, Depletion and Amortization, Total | $ 1,200 | $ 1,500 | $ 1,300

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130549-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130531-203044 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130533-203044 + Details
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