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Note 1 - Summary of Significant Accounting Policies (Details Textual) $ in Thousands		3 Months Ended		12 Months Ended			42 Months Ended
	Jul. 08, 2020 USD ($)	Jun. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2022 USD ($) shares	Dec. 31, 2021 USD ($) shares	Dec. 31, 2020 USD ($)	Mar. 31, 2018 USD ($)	Apr. 01, 2024 USD ($)	Dec. 01, 2022 USD ($)	Mar. 21, 2021 USD ($)	Sep. 30, 2020 USD ($)
Number of Reportable Segments					4
Insurance Policy Primary Occurence Limit					$ 7,000					$ 9,000
Insurance Policy Excess Coverage					3,000					1,000
Insurance Policy Excess Coverage					3,000					$ 1,000
Disposal Group, Including Discontinued Operation, Contingent Liabilities				$ 4,100	5,100
Repayments of Lines of Credit				60,226	695,513
Disposal Group, Including Discontinued Operation, Other Liabilities, Noncurrent				4,100	5,100
Contract with Customer, Liability, Revenue Recognized				$ 1,400	400
Accounts Receivable, after Allowance for Credit Loss, Total					$ 142,400				$ 119,800
Finite-Lived Intangible Asset, Useful Life (Year)				138 months	102 months
Workers Compensation Self Insurance Per Claim					$ 1,300
Cargo Losses Purchased Coverage per Claim					300
Employee Annual Insuarnce Deductible Per Claim					$ 400
Physical Damage Coverage					100.00%
Drivers Advances and Other Receivables Net Of Allowance				$ 3,798	$ 8,792
Auto Policy Release Premium Refund							$ 7,300
Interest Costs Capitalized				$ 300	$ 100
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures, Total (in shares) | shares				358,000	217,000
Restricted Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) | shares					0
Share-Based Payment Arrangement, Option [Member]
Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture, Total (in shares) | shares				161,000
Employee Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) | shares				104	124,000
Receivables from Insurers [Member]
Drivers Advances and Other Receivables Net Of Allowance					$ 0
Insurance Settlements Receivable, Current				$ 700	900
Insurance Settlements Receivable, Noncurrent				$ 0	$ 7,300
Minimum [Member]
Finite-Lived Intangible Asset, Useful Life (Year)					3 years
Maximum [Member]
Finite-Lived Intangible Asset, Useful Life (Year)					15 years
Tractors [Member]
Property, Plant and Equipment, Useful Life (Year)					5 years
Tractors [Member] | Minimum [Member]
Property, Plant and Equipment, Salvage Value, Percentage					10.00%
Tractors [Member] | Maximum [Member]
Property, Plant and Equipment, Salvage Value, Percentage					35.00%
Refrigerated Trailers [Member]
Property, Plant and Equipment, Useful Life (Year)					7 years
Dry Van Trailers [Member]
Property, Plant and Equipment, Useful Life (Year)					10 years
Dry Van Trailers [Member] | Minimum [Member]
Property, Plant and Equipment, Salvage Value, Percentage					28.00%
Dry Van Trailers [Member] | Maximum [Member]
Property, Plant and Equipment, Salvage Value, Percentage					29.00%
Revenue Equipment [Member] | Minimum [Member]
Property, Plant and Equipment, Useful Life (Year)				3 years
Capital Leases of Lessee, Term of Contract (Month)					48 months	48 months
Revenue Equipment [Member] | Maximum [Member]
Property, Plant and Equipment, Useful Life (Year)				10 years
Capital Leases of Lessee, Term of Contract (Month)					84 months	84 months
Customer Concentration Risk [Member] | Revenue Benchmark [Member]
Number of Major Customers						10,000,000
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Ten Customers [Member]
Concentration Risk, Percentage				43.00%	53.00%
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | One Customer [Member]
Number of Major Customers					0
TBK Bank [Member] | Draw Note [Member]
Repayments of Lines of Credit		$ 31,000
Transport Financial Services [Member] | Discontinued Operations, Held-for-sale [Member]
Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net	$ 103,300
Disposal Group, Including Discontinued Operation, Consideration	122,300										$ 108,400
Proceeds from Divestiture of Businesses	108,400
Disposal Group, Including Discontinued Operation, Consideration, Equity Interest Acquired	13,900
Disposal Group, Including Discontinued Operation, Earnout Opportuntiy, Maximum	9,900
Disposal Group Including Discontinued Operation, Dispute over Nature of Assets	66,000
Disposal Group, Including Discontinued Operation, Consideration Returned upon Settlement					$ 28,100
Disposal Group Including Discontinued Operation, Assets Advances Against Future Payments For Services Not Yet Performed	62,000
Disposal Group Including Discontinued Operation, Indemnity, Loss Amount	$ 30,000
Disposal Group Including Discontinued Operation, Indemnity, Percentage of Next 30 Million Loss	50.00%
Disposal Group Including Discontinued Operation, Total Indemnification	$ 45,000
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax, Total	3,700
Disposal Group, Including Discontinued Operation, Contingent Liabilities						$ 44,200
Transport Financial Services [Member] | Discontinued Operations, Disposed of by Sale [Member]
Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net	$ 103,300
Discontinued Operation, Amount of Continuing Cash Flows after Disposal			$ (35,600)
Discontinued Operation, Amount of Adjustment to Prior Period Gain (Loss) on Disposal, Net of Tax, Total			$ 3,400	$ 1,000	$ 3,412
Disposal Group, Including Discontinued Operation, Other Liabilities, Noncurrent				$ 4,100
Forecast [Member]
Insurance Policy Primary Occurence Limit								$ 7,000
Insurance Policy Excess Coverage								3,000
Insurance Policy Excess Coverage								$ 3,000
Transport Enterprise Leasing LLC [Member]
Equity Method Investment, Ownership Percentage				49.00%	49.00%

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