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Note 12 - Segment and Geographic Distribution of Operations - Segment Reporting Information (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Revenue $ 333,444 $ 321,164  
Total vessel operating costs 164,979 167,556  
General and Administrative Expense 29,094 25,329  
Depreciation and amortization 65,432 56,270  
Additions to properties and equipment 19,364 10,942  
Total assets 2,066,166 2,077,816 $ 2,074,904
Costs of other operating revenues 1,430 1,150  
Corporate expenses 258,397 239,266  
Gain on asset dispositions, net 2,538 11,039  
Operating income 75,047 81,898  
Operating Segments [Member]      
Revenue 333,444 321,164  
Crew costs 97,113 102,352  
Repair and maintenance 21,954 21,348  
Insurance 3,034 2,580  
Fuel, lube and supplies 14,378 17,318  
Other 28,500 23,958  
Total vessel operating costs 164,979 167,556  
General and Administrative Expense 15,108 13,337  
Depreciation and amortization 64,483 55,524  
Operating profit 87,444 83,597  
Additions to properties and equipment 17,525 10,227  
Total assets 1,868,191 1,874,382  
Costs of other operating revenues 1,430 1,150  
Operating Segments [Member] | Americas [Member]      
Crew costs 17,440 24,062  
Repair and maintenance 4,266 4,534  
Insurance 571 494  
Fuel, lube and supplies 2,617 4,522  
Other 10,129 5,928  
Total vessel operating costs 35,023 39,540  
General and Administrative Expense 3,542 3,332  
Depreciation and amortization 11,392 10,943  
Operating profit 4,895 10,126  
Additions to properties and equipment 1,933 3,495  
Total assets 354,153 388,140  
Operating Segments [Member] | Asia Pacific [Member]      
Crew costs 20,331 19,306  
Repair and maintenance 2,270 2,769  
Insurance 324 273  
Fuel, lube and supplies 1,767 1,937  
Other 2,118 2,491  
Total vessel operating costs 26,810 26,776  
General and Administrative Expense 2,420 2,126  
Depreciation and amortization 5,318 4,032  
Operating profit 13,680 14,847  
Additions to properties and equipment 592 194  
Total assets 162,329 193,734  
Operating Segments [Member] | Middle East [Member]      
Crew costs 13,280 13,270  
Repair and maintenance 4,100 4,508  
Insurance 529 420  
Fuel, lube and supplies 2,039 2,304  
Other 4,588 6,006  
Total vessel operating costs 24,536 26,508  
General and Administrative Expense 2,937 2,622  
Depreciation and amortization 7,266 7,273  
Operating profit 8,563 1,529  
Additions to properties and equipment 854 834  
Total assets 188,242 183,945  
Operating Segments [Member] | Europe and Mediterranean [Member]      
Crew costs 27,111 26,282  
Repair and maintenance 6,711 5,493  
Insurance 848 756  
Fuel, lube and supplies 3,147 4,094  
Other 4,738 4,359  
Total vessel operating costs 42,555 40,984  
General and Administrative Expense 3,663 3,202  
Depreciation and amortization 24,609 21,438  
Operating profit 7,378 14,757  
Additions to properties and equipment 1,314 5,493  
Total assets 635,046 669,886  
Operating Segments [Member] | West Africa [Member]      
Crew costs 18,951 19,432  
Repair and maintenance 4,607 4,044  
Insurance 762 637  
Fuel, lube and supplies 4,808 4,461  
Other 6,927 5,174  
Total vessel operating costs 36,055 33,748  
General and Administrative Expense 2,546 2,055  
Depreciation and amortization 15,898 11,838  
Operating profit 51,613 41,010  
Additions to properties and equipment 12,832 211  
Total assets 528,421 438,677  
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member]      
Additions to properties and equipment 1,839 715  
Total assets 197,975 203,434  
Corporate expenses (14,935) (12,738)  
Vessel [Member]      
Revenue 330,699 318,686  
Vessel [Member] | Operating Segments [Member]      
Revenue 330,699 318,686  
Vessel [Member] | Operating Segments [Member] | Americas [Member]      
Revenue 54,852 63,941  
Vessel [Member] | Operating Segments [Member] | Asia Pacific [Member]      
Revenue 48,228 47,781  
Vessel [Member] | Operating Segments [Member] | Middle East [Member]      
Revenue 43,302 37,932  
Vessel [Member] | Operating Segments [Member] | Europe and Mediterranean [Member]      
Revenue 78,205 80,381  
Vessel [Member] | Operating Segments [Member] | West Africa [Member]      
Revenue 106,112 88,651  
Product and Service, Other [Member]      
Revenue 2,745 2,478  
Product and Service, Other [Member] | Operating Segments [Member]      
Revenue $ 2,745 $ 2,478