Note 8 - Acquisition of AAT Carriers, Inc. - Summary of Preliminary Fair Values of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Apr. 06, 2023	Dec. 31, 2022	Feb. 09, 2022
Property and equipment		$ 42,277
Goodwill	$ 75,747		$ 58,217
AAT Carriers Inc [Member]
Accounts receivable				$ 842
Prepaid expenses				33
Other short-term assets				19
Property and equipment				7,994
Other intangibles, net				32,000
Total identifiable assets acquired				40,888
Accounts payable				(19)
Accrued expenses				(1,396)
Finance lease obligations				(458)
Other long-term liabilities				(3)
Total liabilities assumed				(1,876)
Net identifiable assets acquired				39,012
Goodwill				15,699
Net assets acquired				$ 54,711