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Note 1 - Summary of Significant Accounting Policies (Details Textual) $ in Thousands		12 Months Ended
	Dec. 31, 2024 USD ($)	Dec. 31, 2024 USD ($) shares	Dec. 31, 2023 USD ($) shares	Dec. 31, 2022 USD ($) shares	Apr. 01, 2024 USD ($)
Number of Reportable Segments		4
Insurance Policy Primary Occurence Limit	$ 7,000	$ 7,000	$ 9,000		$ 7,000
Insurance Policy Excess Coverage	3,000	3,000	1,000		3,000
Insurance Policy Excess Coverage	3,000	3,000	1,000		$ 3,000
Contract with Customer, Liability, Revenue Recognized		700	1,100	$ 1,400
Accounts Receivable, after Allowance for Credit Loss	141,600	141,600	142,500	119,800
Cash, Uninsured Amount	$ 36,400	36,400
Depreciation, Increase Decrease		6,400
Gain (Loss) on Disposition of Property Plant Equipment		$ (1,630)	$ 12,585	40,322
Finite-Lived Intangible Asset, Useful Life (Year)	142 months	142 months	151 months
Accrued Liabilities	$ 51,300	$ 51,300	$ 59,100
Employee-related Liabilities	26,900	26,900	25,900
Accrued Purchased Transportation	4,700	4,700	$ 8,400
Workers Compensation Self Insurance Per Claim		1,500
Cargo Losses Purchased Coverage per Claim		300
Employee Annual Insuarnce Deductible Per Claim		$ 400
Physical Damage Coverage		100.00%	100.00%
Drivers Advances and Other Receivables Net Of Allowance	3,999	$ 3,999	$ 4,367
Interest Costs Capitalized		$ 100	$ 300	$ 300
Restricted Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) \| shares			0
Employee Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) \| shares		0	0	208
Receivables from Insurers [Member]
Drivers Advances and Other Receivables Net Of Allowance	1,100	$ 1,100	$ 800
Insurance Settlements Receivable, Noncurrent	$ 600	$ 600	1,300
Maximum [Member]
Finite-Lived Intangible Asset, Useful Life (Year)	17 years	17 years
Minimum [Member]
Finite-Lived Intangible Asset, Useful Life (Year)	3 years	3 years
Tractors [Member]
Property, Plant and Equipment, Useful Life (Year)	5 years	5 years
Property, Plant and Equipment, Salvage Value, Percentage	0.00%	0.00%
Tractors [Member] \| Maximum [Member]
Property, Plant and Equipment, Salvage Value, Percentage	35.00%	35.00%
Refrigerated Trailers [Member]
Property, Plant and Equipment, Useful Life (Year)	7 years	7 years
Dry Van Trailers [Member]
Property, Plant and Equipment, Useful Life (Year)	10 years	10 years
Dry Van Trailers [Member] \| Maximum [Member]
Property, Plant and Equipment, Salvage Value, Percentage	25.00%	25.00%
Dry Van Trailers [Member] \| Minimum [Member]
Property, Plant and Equipment, Salvage Value, Percentage	20.00%	20.00%
Terminal Property [Member] \| CALIFORNIA
Gain (Loss) on Disposition of Property Plant Equipment			$ 7,600
Revenue Equipment [Member] \| Maximum [Member]
Property, Plant and Equipment, Useful Life (Year)	20 years	20 years
Capital Leases of Lessee, Term of Contract (Month)		84 months
Revenue Equipment [Member] \| Minimum [Member]
Property, Plant and Equipment, Useful Life (Year)	2 years	2 years
Capital Leases of Lessee, Term of Contract (Month)		48 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		45.00%	44.00%	43.00%
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| One Customer [Member]
Number of Major Customers			1	0
Transport Enterprise Leasing LLC [Member]
Equity Method Investment, Ownership Percentage	49.00%	49.00%	49.00%