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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