Note 2 - Acquisitions - Provisional Amounts for Acquired Assets and Liabilities (Details) - Swire Pacific Offshore Holdings Ltd. [Member] - USD ($) $ in Thousands	Dec. 31, 2022	Apr. 22, 2022	Dec. 31, 2021
Assets
Cash		$ 33,152
Trade and other receivables		64,621
Marine operating supplies		5,122
Assets held for sale		2,500
Prepaid expenses and other current assets		4,174
Net properties and equipment	$ 171,000	171,007
Indemnification assets (A)	$ 28,369	32,279	$ 0
Other assets		1,153
Total assets		314,008
Accounts payable		1,594
Accrued expenses		54,924
Other current liabilities		25,103
Other liabilities		16,886
Total liabilities		98,507
Net assets acquired		$ 215,501