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Note 13 - Segment and Geographic Distribution of Operations - Segment Reporting Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Revenue | $ 341,113 | $ 340,356 | $ 1,015,988 | $ 1,000,750 |
Total vessel operating costs | 176,130 | 178,654 | 508,463 | 522,723 |
General and administrative | 35,256 | 28,471 | 95,563 | 80,129 |
Depreciation and amortization | 66,404 | 62,435 | 196,150 | 178,150 |
Additions to properties and equipment | 10,023 | 5,712 | 36,242 | 23,046 |
Total assets | 2,128,880 | 2,047,131 | 2,128,880 | 2,047,131 | $ 2,074,904
Costs of other operating revenues | 1,252 | 901 | 5,790 | 2,867 |
Corporate expenses | 278,462 | 270,410 | 797,368 | 770,779 |
Gain on asset dispositions, net | 580 | 51 | 8,598 | 13,090 |
Operating income | 62,651 | 69,946 | 218,620 | 229,971 |
Operating Segments [Member] |  |  |  |  |
Revenue | 341,113 | 340,356 | 1,015,988 | 1,000,750 |
Crew costs | 105,529 | 107,708 | 302,118 | 316,291 |
Repair and maintenance | 28,636 | 25,554 | 74,527 | 71,645 |
Insurance | 2,892 | 2,965 | 7,566 | 8,170 |
Fuel, lube and supplies | 16,441 | 17,213 | 45,926 | 50,093 |
Other | 22,632 | 25,214 | 78,326 | 76,524 |
Total vessel operating costs | 176,130 | 178,654 | 508,463 | 522,723 |
General and administrative | 15,080 | 14,577 | 45,143 | 41,617 |
Depreciation and amortization | 65,533 | 61,674 | 193,407 | 175,880 |
Operating profit | 83,118 | 84,550 | 263,185 | 257,663 |
Additions to properties and equipment | 8,145 | 4,720 | 30,813 | 20,371 |
Total assets | 1,859,619 | 1,874,966 | 1,859,619 | 1,874,966 |
Costs of other operating revenues | 1,252 | 901 | 5,790 | 2,867 |
Operating Segments [Member] | Americas [Member] |  |  |  |  |
Crew costs | 22,634 | 21,646 | 59,726 | 69,026 |
Repair and maintenance | 5,350 | 5,227 | 14,446 | 15,406 |
Insurance | 570 | 571 | 1,492 | 1,528 |
Fuel, lube and supplies | 2,464 | 3,165 | 7,296 | 10,681 |
Other | 4,598 | 5,921 | 20,692 | 17,596 |
Total vessel operating costs | 35,616 | 36,530 | 103,652 | 114,237 |
General and administrative | 3,720 | 3,695 | 11,047 | 10,441 |
Depreciation and amortization | 12,923 | 11,082 | 36,033 | 33,438 |
Operating profit | 24,654 | 13,299 | 49,791 | 43,573 |
Additions to properties and equipment | 396 | 594 | 2,682 | 5,577 |
Total assets | 421,427 | 353,495 | 421,427 | 353,495 |
Operating Segments [Member] | Asia Pacific [Member] |  |  |  |  |
Crew costs | 20,887 | 24,685 | 59,736 | 67,014 |
Repair and maintenance | 3,842 | 3,834 | 9,477 | 9,695 |
Insurance | 330 | 327 | 830 | 878 |
Fuel, lube and supplies | 2,443 | 2,560 | 5,999 | 6,832 |
Other | 2,768 | 2,396 | 7,203 | 7,855 |
Total vessel operating costs | 30,270 | 33,802 | 83,245 | 92,274 |
General and administrative | 2,362 | 2,365 | 6,832 | 6,575 |
Depreciation and amortization | 5,824 | 4,824 | 16,845 | 13,366 |
Operating profit | 15,330 | 15,292 | 40,788 | 47,070 |
Additions to properties and equipment | 124 | 695 | 1,091 | 1,754 |
Total assets | 155,383 | 180,786 | 155,383 | 180,786 |
Operating Segments [Member] | Middle East [Member] |  |  |  |  |
Crew costs | 13,541 | 13,071 | 40,123 | 39,881 |
Repair and maintenance | 4,556 | 4,625 | 12,917 | 13,433 |
Insurance | 484 | 510 | 1,356 | 1,394 |
Fuel, lube and supplies | 2,916 | 2,842 | 8,205 | 7,420 |
Other | 4,242 | 6,000 | 13,491 | 19,144 |
Total vessel operating costs | 25,739 | 27,048 | 76,092 | 81,272 |
General and administrative | 2,686 | 2,928 | 8,470 | 8,397 |
Depreciation and amortization | 8,616 | 7,871 | 23,539 | 22,959 |
Operating profit | 4,994 | (900) | 17,451 | (1,213) |
Additions to properties and equipment | 5,387 | (53) | 6,570 | 1,253 |
Total assets | 186,655 | 176,428 | 186,655 | 176,428 |
Operating Segments [Member] | Europe and Mediterranean [Member] |  |  |  |  |
Crew costs | 30,104 | 28,818 | 86,557 | 82,185 |
Repair and maintenance | 7,481 | 7,279 | 19,928 | 19,830 |
Insurance | 797 | 827 | 2,062 | 2,344 |
Fuel, lube and supplies | 3,469 | 3,924 | 8,769 | 11,479 |
Other | 4,805 | 4,974 | 15,730 | 13,684 |
Total vessel operating costs | 46,656 | 45,822 | 133,046 | 129,522 |
General and administrative | 3,479 | 3,222 | 10,527 | 9,406 |
Depreciation and amortization | 22,253 | 23,918 | 69,695 | 67,795 |
Operating profit | 11,352 | 12,363 | 47,957 | 42,249 |
Additions to properties and equipment | 1,155 | 3,128 | 3,053 | 9,850 |
Total assets | 591,310 | 686,748 | 591,310 | 686,748 |
Operating Segments [Member] | West Africa [Member] |  |  |  |  |
Crew costs | 18,363 | 19,488 | 55,976 | 58,185 |
Repair and maintenance | 7,407 | 4,589 | 17,759 | 13,281 |
Insurance | 711 | 730 | 1,826 | 2,026 |
Fuel, lube and supplies | 5,149 | 4,722 | 15,657 | 13,681 |
Other | 6,219 | 5,923 | 21,210 | 18,245 |
Total vessel operating costs | 37,849 | 35,452 | 112,428 | 105,418 |
General and administrative | 2,833 | 2,367 | 8,267 | 6,798 |
Depreciation and amortization | 15,917 | 13,979 | 47,295 | 38,322 |
Operating profit | 25,418 | 43,526 | 103,048 | 122,275 |
Additions to properties and equipment | 1,083 | 356 | 17,417 | 1,937 |
Total assets | 504,844 | 477,509 | 504,844 | 477,509 |
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] |  |  |  |  |
Additions to properties and equipment | 1,878 | 992 | 5,429 | 2,675 |
Total assets | 269,261 | 172,165 | 269,261 | 172,165 |
Corporate expenses | (21,047) | (14,655) | (53,163) | (40,782) |
Vessel [Member] |  |  |  |  |
Revenue | 338,491 | 338,485 | 1,006,048 | 994,174 |
Vessel [Member] | Operating Segments [Member] |  |  |  |  |
Revenue | 338,491 | 338,485 | 1,006,048 | 994,174 |
Vessel [Member] | Operating Segments [Member] | Americas [Member] |  |  |  |  |
Revenue | 76,913 | 64,606 | 200,523 | 201,689 |
Vessel [Member] | Operating Segments [Member] | Asia Pacific [Member] |  |  |  |  |
Revenue | 53,786 | 56,283 | 147,710 | 159,285 |
Vessel [Member] | Operating Segments [Member] | Middle East [Member] |  |  |  |  |
Revenue | 42,035 | 36,947 | 125,552 | 111,415 |
Vessel [Member] | Operating Segments [Member] | Europe and Mediterranean [Member] |  |  |  |  |
Revenue | 83,740 | 85,325 | 261,225 | 248,972 |
Vessel [Member] | Operating Segments [Member] | West Africa [Member] |  |  |  |  |
Revenue | 82,017 | 95,324 | 271,038 | 272,813 |
Product and Service, Other [Member] |  |  |  |  |
Revenue | 2,622 | 1,871 | 9,940 | 6,576 |
Product and Service, Other [Member] | Operating Segments [Member] |  |  |  |  |
Revenue | $ 2,622 | $ 1,871 | $ 9,940 | $ 6,576 |

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