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Note 1 - Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands		1 Months Ended	3 Months Ended
	Jul. 08, 2020	Oct. 31, 2020	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2021	Dec. 31, 2020	Sep. 23, 2020
Discontinued Operation, Amount of Adjustment to Prior Period Gain (Loss) on Disposal, Net of Tax, Total			$ (0)		$ 3,412
Repayments of Lines of Credit			46,899		220,651
Disposal Group, Including Discontinued Operation, Other Liabilities, Noncurrent			$ 5,100			$ 5,100
Tractors [Member]
Property, Plant and Equipment, Useful Life (Year)			5 years
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] | Maximum [Member]
Property, Plant and Equipment, Salvage Value, Percentage			21.00%
Dry Van Trailers [Member] | Minimum [Member]
Property, Plant and Equipment, Salvage Value, Percentage			28.00%
TBK Bank [Member] | Draw Note [Member]
Repayments of Lines of Credit				$ 31,000
Long-term Debt, Total			$ 0
Transport Financial Services [Member] | Discontinued Operations, Disposed of by 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
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax, Total		$ 3,700
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						$ 44,200
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			(0)		$ 3,412
Disposal Group, Including Discontinued Operation, Other Liabilities, Noncurrent			$ 5,100

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