Note 9 - Acquisitions (Details Textual) - USD ($) $ in Millions			9 Months Ended
Sep. 14, 2022	Feb. 28, 2022	Sep. 30, 2022
Zenith Freight Lines, LLC [Member]
Payments to Acquire Businesses, Gross		$ 87.1
Business Combination, Consideration Transferred, Total		86.9	$ 87.1
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles		42.7	$ 43.6
Goodwill, Ending Balance		11.4
Zenith Freight Lines, LLC [Member] \| General and Administrative Expense [Member]
Business Combination, Acquisition Related Costs		$ 0.9
Alterri Distribution Center, LLC [Member]
Business Combination, Consideration Transferred, Total	$ 31.0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	0.9
Goodwill, Ending Balance	$ 8.7

This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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The amount of identifiable intangible assets recognized as of the acquisition date.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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