Note 6 - Acquisition of Sims Transport Services, LLC - Allocation of Preliminary Purchase Price (Details) - USD ($) $ in Thousands		12 Months Ended
Aug. 18, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash paid pursuant to Stock Purchase Agreement		$ 107,934	$ 38,501	$ (0)
Sims Transport Services, LLC [Member]
Cash paid pursuant to Stock Purchase Agreement	$ 8,573
Cash acquired included in historical book value of Sims' assets and liabilities	(526)
Contingent consideration, Acquisition	1,786
Net purchase price	$ 9,833

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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Amount of liabilities incurred by the acquirer as part of consideration transferred in a business combination.

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