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Note 13 - Segment and Geographic Distribution of Operations - Segment Reporting Information (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Revenues of Angolan operations (in thousands) $ 83,504 $ 116,368
Gross Profit (16,848) (3,615)
Corporate expenses (109,805) (134,901)
Long-lived asset impairments 0 (10,207)
Gain (loss) on asset dispositions, net (1,948) 5,331
Operating loss (26,301) (18,533)
Depreciation and amortization 29,727 27,107
Property Plant And Equipment Additions 1,196 2,449
Product and Service, Other [Member]    
Revenues of Angolan operations (in thousands) 2,511 4,394
Operating Segments [Member]    
Depreciation and amortization 29,727 27,107
Operating Segments [Member] | Americas One [Member]    
Gross Profit (1,651) (1,164)
Depreciation and amortization 8,007 7,496
Operating Segments [Member] | Middle East and Asia Pacific [Member]    
Gross Profit (1,853) (856)
Depreciation and amortization 6,880 5,527
Property Plant And Equipment Additions 8 680
Operating Segments [Member] | Europe and Mediterranean [Member]    
Gross Profit (8,021) 1,547
Depreciation and amortization 7,484 6,819
Property Plant And Equipment Additions 306 440
Operating Segments [Member] | West Africa [Member]    
Gross Profit (6,767) (4,863)
Depreciation and amortization 6,570 6,404
Property Plant And Equipment Additions 495 751
Operating Segments [Member] | Service [Member]    
Revenues of Angolan operations (in thousands) 83,504 116,368
Operating Segments [Member] | Service [Member] | Americas One [Member]    
Revenues of Angolan operations (in thousands) 26,224 31,859
Operating Segments [Member] | Service [Member] | Middle East and Asia Pacific [Member]    
Revenues of Angolan operations (in thousands) 24,414 24,828
Operating Segments [Member] | Service [Member] | Europe and Mediterranean [Member]    
Revenues of Angolan operations (in thousands) 14,749 29,491
Operating Segments [Member] | Service [Member] | West Africa [Member]    
Revenues of Angolan operations (in thousands) 15,606 25,796
Operating Segments [Member] | Product and Service, Other [Member]    
Revenues of Angolan operations (in thousands) 2,511 4,394
Gross Profit 1,444 1,721
Corporate, Non-Segment [Member]    
Corporate expenses (7,505) (10,042)
Depreciation and amortization 786 861
Property Plant And Equipment Additions $ 387 $ 578