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Note 13 - Segment Information, Geographical Data and Major Customers - Segment Reporting Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Revenue $ 371,033 $ 397,038 $ 486,549
Corporate expenses 466,049 583,840 573,153
Gain (loss) on asset dispositions, net (2,901) 7,591 2,263
Affiliate credit loss impairment expense (400) (52,981) 0
Affiliate guarantee obligation 0 (2,000) 0
Asset impairments and other (15,643) (74,109) (37,773)
Operating loss (95,016) (186,802) (86,604)
Depreciation and amortization 114,544 116,709 101,931
Property Plant And Equipment Additions 8,951 14,900 17,998
Total Assets 1,095,780 1,251,177 1,579,528
Vessel [Member]      
Revenue 361,569 386,174 477,015
Product and Service, Other [Member]      
Revenue 9,464 10,864 9,534
Operating Segments [Member]      
Gross Profit (39,164) (29,670) 6,894
Operating Segments [Member] | Vessel [Member]      
Gross Profit (46,397) (37,128) 160
Operating Segments [Member] | Product and Service, Other [Member]      
Revenue 9,464 10,864 9,534
Gross Profit 7,233 7,458 6,734
Operating Segments [Member] | Americas [Member]      
Depreciation and amortization 30,856 32,079 27,493
Property Plant And Equipment Additions 0 2,842 969
Total Assets 278,394 338,649 375,297
Operating Segments [Member] | Americas [Member] | Vessel [Member]      
Revenue 102,151 126,676 136,958
Gross Profit (11,270) 4,944 (805)
Operating Segments [Member] | Middle East and Asia Pacific [Member]      
Depreciation and amortization 25,992 24,244 21,440
Property Plant And Equipment Additions (42) 2,629 5,237
Total Assets 183,287 226,422 270,413
Operating Segments [Member] | Middle East and Asia Pacific [Member] | Vessel [Member]      
Revenue 102,537 97,133 90,321
Gross Profit (1,174) (5,935) (6,044)
Operating Segments [Member] | Europe and Mediterranean [Member]      
Depreciation and amortization 28,163 29,222 30,053
Property Plant And Equipment Additions 764 1,059 4,001
Total Assets 293,760 302,214 358,943
Operating Segments [Member] | Europe and Mediterranean [Member] | Vessel [Member]      
Revenue 80,914 83,602 123,711
Gross Profit (16,968) (8,629) (1,289)
Operating Segments [Member] | West Africa [Member]      
Depreciation and amortization 26,196 27,787 21,166
Property Plant And Equipment Additions 6,341 6,028 2,721
Total Assets 223,988 242,825 376,087
Operating Segments [Member] | West Africa [Member] | Vessel [Member]      
Revenue 75,967 78,763 126,025
Gross Profit (16,985) (27,508) 8,298
Corporate, Non-Segment [Member]      
Corporate expenses (36,908) (35,633) (57,988)
Depreciation and amortization 3,337 3,377 1,779
Property Plant And Equipment Additions 1,888 2,342 5,070
Total Assets $ 116,351 $ 141,067 $ 198,788