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Note 14 - Segment Information, Geographical Data and Major Customers - Segment Reporting Information (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Revenue | $ 1,345,835 | $ 1,009,985 | $ 647,684
Total vessel operating costs | 693,107 | 556,515 | 397,301
General and Administrative Expense | 110,817 | 95,283 | 101,921
Depreciation and amortization | 242,770 | 180,331 | 119,160
Additions to properties and equipment | 27,580 | 45,852 | 16,637
Total assets | 2,074,904 | 2,062,774 | 1,297,656
Costs of other operating revenues | 3,555 | 4,342 | 2,130
Corporate expenses | 1,034,487 | 827,770 | 620,976
Gain on asset dispositions, net | 15,762 | 8,701 | 250
Long-lived asset impairments and other | 0 | 0 | (714)
Operating income | 311,348 | 182,215 | 26,708
Operating Segments [Member] |  |  |
Revenue | 1,345,835 | 1,009,985 | 647,684
Crew costs | 416,276 | 329,473 | 242,364
Repair and maintenance | 98,376 | 78,716 | 51,256
Insurance | 11,027 | 9,297 | 6,765
Fuel, lube and supplies | 65,371 | 60,548 | 43,729
Other | 102,057 | 78,481 | 53,187
Total vessel operating costs | 693,107 | 556,515 | 397,301
General and Administrative Expense | 56,131 | 51,850 | 51,114
Depreciation and amortization | 239,676 | 178,110 | 116,384
Operating profit | 353,366 | 219,168 | 80,755
Additions to properties and equipment | 23,766 | 40,684 | 12,921
Total assets | 1,875,706 | 1,869,843 | 1,224,358
Costs of other operating revenues | 3,555 | 4,342 | 2,130
Operating Segments [Member] | Americas [Member] |  |  |
Crew costs | 87,545 | 86,328 | 56,767
Repair and maintenance | 20,677 | 17,295 | 12,706
Insurance | 2,034 | 1,891 | 1,439
Fuel, lube and supplies | 13,635 | 13,175 | 9,655
Other | 24,391 | 19,232 | 13,442
Total vessel operating costs | 148,282 | 137,921 | 94,009
General and Administrative Expense | 14,046 | 15,105 | 10,926
Depreciation and amortization | 44,822 | 41,215 | 29,920
Operating profit | 54,779 | 42,964 | 12,016
Additions to properties and equipment | 5,980 | 2,916 | 4,468
Total assets | 350,126 | 418,151 | 309,985
Operating Segments [Member] | Asia Pacific [Member] |  |  |
Crew costs | 88,968 | 41,940 | 29,433
Repair and maintenance | 13,999 | 9,212 | 3,077
Insurance | 1,197 | 794 | 516
Fuel, lube and supplies | 8,834 | 5,251 | 4,139
Other | 10,311 | 7,751 | 5,081
Total vessel operating costs | 123,309 | 64,948 | 42,246
General and Administrative Expense | 8,544 | 8,147 | 12,299
Depreciation and amortization | 18,606 | 10,669 | 5,960
Operating profit | 59,869 | 38,471 | 3,726
Additions to properties and equipment | 2,157 | 7,839 | 317
Total assets | 173,587 | 167,085 | 148,684
Operating Segments [Member] | Middle East [Member] |  |  |
Crew costs | 53,390 | 53,416 | 44,944
Repair and maintenance | 17,595 | 16,187 | 12,210
Insurance | 1,882 | 1,784 | 1,412
Fuel, lube and supplies | 10,019 | 12,092 | 10,531
Other | 24,076 | 17,127 | 9,015
Total vessel operating costs | 106,962 | 100,606 | 78,112
General and Administrative Expense | 11,320 | 9,254 | 9,120
Depreciation and amortization | 30,135 | 26,566 | 24,236
Operating profit | 3,770 | (1,051) | (1,093)
Additions to properties and equipment | 1,260 | 3,016 | 3,911
Total assets | 180,286 | 191,927 | 197,054
Operating Segments [Member] | Europe and Mediterranean [Member] |  |  |
Crew costs | 109,178 | 78,613 | 49,709
Repair and maintenance | 28,288 | 17,029 | 9,239
Insurance | 3,171 | 2,218 | 1,442
Fuel, lube and supplies | 14,650 | 11,697 | 6,026
Other | 18,864 | 13,758 | 8,426
Total vessel operating costs | 174,151 | 123,315 | 74,842
General and Administrative Expense | 12,726 | 10,063 | 8,158
Depreciation and amortization | 92,331 | 63,152 | 27,734
Operating profit | 53,873 | 33,687 | 18,844
Additions to properties and equipment | 11,069 | 7,320 | 1,302
Total assets | 659,158 | 671,626 | 282,670
Operating Segments [Member] | West Africa [Member] |  |  |
Crew costs | 77,195 | 69,176 | 61,511
Repair and maintenance | 17,817 | 18,993 | 14,024
Insurance | 2,743 | 2,610 | 1,956
Fuel, lube and supplies | 18,233 | 18,333 | 13,378
Other | 24,415 | 20,613 | 17,223
Total vessel operating costs | 140,403 | 129,725 | 108,092
General and Administrative Expense | 9,495 | 9,281 | 10,611
Depreciation and amortization | 53,782 | 36,508 | 28,534
Operating profit | 176,432 | 98,447 | 43,112
Additions to properties and equipment | 3,300 | 19,593 | 2,923
Total assets | 512,549 | 421,054 | 285,965
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] |  |  |
Additions to properties and equipment | 3,814 | 5,168 | 3,716
Total assets | 199,198 | 192,931 | 73,298
Corporate expenses | (57,780) | (45,654) | (53,583)
Vessel [Member] |  |  |
Revenue | 1,337,637 | 998,993 | 641,404
Vessel [Member] | Operating Segments [Member] |  |  |
Revenue | 1,337,637 | 998,993 | 641,404
Vessel [Member] | Operating Segments [Member] | Americas [Member] |  |  |
Revenue | 261,929 | 237,205 | 146,871
Vessel [Member] | Operating Segments [Member] | Asia Pacific [Member] |  |  |
Revenue | 210,328 | 122,235 | 64,231
Vessel [Member] | Operating Segments [Member] | Middle East [Member] |  |  |
Revenue | 152,187 | 135,375 | 110,375
Vessel [Member] | Operating Segments [Member] | Europe and Mediterranean [Member] |  |  |
Revenue | 333,081 | 230,217 | 129,578
Vessel [Member] | Operating Segments [Member] | West Africa [Member] |  |  |
Revenue | 380,112 | 273,961 | 190,349
Product and Service, Other [Member] |  |  |
Revenue | 8,198 | 10,992 | 6,280
Product and Service, Other [Member] | Operating Segments [Member] |  |  |
Revenue | $ 8,198 | $ 10,992 | $ 6,280

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