Note 6 - Acquisition of Sims Transport Services, LLC - Summary of Preliminary Fair Values of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Aug. 18, 2023	Dec. 31, 2022
Goodwill	$ 75,747		$ 58,217
Sims Transport Services, LLC [Member]
Accounts receivable		$ 735
Other intangibles, net		6,090
Total identifiable assets acquired		6,825
Accounts payable		(457)
Accrued expenses		(4)
Deferred tax liability		(1,614)
Total liabilities assumed		(2,075)
Net identifiable assets acquired		4,750
Goodwill		5,083
Net assets acquired		$ 9,833