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Note 2 - Acquisitions - Provisional Amounts for Acquired Assets and Liabilities (Details) - Swire Pacific Offshore Holdings Ltd. [Member] - USD ($) $ in Thousands | Dec. 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 | $ 174,400 |  | 174,415
Indemnification assets (A) | $ 17,370 | $ 28,369 | 32,279
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

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