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Note 13 - Segment Information, Geographical Data and Major Customers - Segment Reporting Information (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Revenue $ 105,729 $ 83,504  
Corporate expenses 113,039 109,805  
Long-lived asset impairment credit 500 0  
Gain (loss) on asset dispositions, net 207 (1,948)  
Operating loss (7,310) (26,301)  
Depreciation and amortization 26,657 29,727  
Property Plant And Equipment Additions 1,229 1,196  
Total Assets 1,054,130   $ 1,095,780
Vessel [Member]      
Revenue 103,876 80,993  
Product and Service, Other [Member]      
Revenue 1,853 2,511  
Operating Segments [Member]      
Gross Profit 2,486 (16,848)  
Operating Segments [Member] | Product and Service, Other [Member]      
Revenue 1,853 2,511  
Gross Profit 1,492 1,444  
Operating Segments [Member] | Americas [Member]      
Depreciation and amortization 7,116 8,007  
Total Assets 282,522   278,394
Operating Segments [Member] | Americas [Member] | Vessel [Member]      
Revenue 28,444 26,224  
Gross Profit (82) (1,651)  
Operating Segments [Member] | Middle East and Asia Pacific [Member]      
Depreciation and amortization 6,255 6,880  
Property Plant And Equipment Additions 24 8  
Total Assets 203,750   183,287
Operating Segments [Member] | Middle East and Asia Pacific [Member] | Vessel [Member]      
Revenue 25,115 24,414  
Gross Profit 290 (1,853)  
Operating Segments [Member] | Europe and Mediterranean [Member]      
Depreciation and amortization 6,762 7,484  
Property Plant And Equipment Additions 276 306  
Total Assets 275,036   293,760
Operating Segments [Member] | Europe and Mediterranean [Member] | Vessel [Member]      
Revenue 23,919 14,749  
Gross Profit (2,429) (8,021)  
Operating Segments [Member] | West Africa [Member]      
Depreciation and amortization 5,741 6,570  
Property Plant And Equipment Additions 350 495  
Total Assets 188,054   223,988
Operating Segments [Member] | West Africa [Member] | Vessel [Member]      
Revenue 26,398 15,606  
Gross Profit 3,215 (6,767)  
Corporate, Non-Segment [Member]      
Corporate expenses (10,503) (7,505)  
Depreciation and amortization 783 786  
Property Plant And Equipment Additions 579 $ 387  
Total Assets $ 104,768   $ 116,351