Note 3 - Acquisition of Swire Pacific Offshore Holdings Ltd - Provisional Amounts for Acquired Assets and Liabilities (Details) - Swire Pacific Offshore Holdings Ltd. [Member] - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022	Apr. 22, 2022
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			174,415
Indemnification assets	$ 27,698	$ 28,369	32,279	[1]
Other assets			1,153
Total assets			317,416
Accounts payable			1,594
Accrued expenses			54,924
Other current liabilities			28,511
Other liabilities			16,886
Total liabilities			101,915
Net assets acquired			$ 215,501

[1] Consists primarily of tax liabilities existing at the Closing Date that are recorded in other current liabilities and other liabilities.