Note 6 - Acquisition of AAT Carriers, Inc. - Summary of Preliminary Fair Values of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Feb. 09, 2022	Dec. 31, 2021
Goodwill	$ 58,217		$ 42,518
AAT Carriers Inc [Member]
Accounts receivable		$ 842
Prepaid expenses		33
Other short-term assets		19
Net property and equipment		7,994
Credentialing intangible asset		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