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Note 14 - Segment Information, Geographical Data and Major Customers - Segment Reporting Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Revenue $ 397,038 $ 486,549 $ 406,520
Gross Profit (29,670) 6,894 6,066
Corporate expenses 583,840 573,153 514,017
Gain on asset dispositions, net 7,591 2,263 10,624
Affiliate credit loss impairment expense (52,981) 0 0
Affiliate guarantee obligation (2,000) 0 0
Impairment of due from affiliate 0 0 (20,083)
Asset impairments and other (74,109) (37,773) (61,132)
Operating loss (186,802) (86,604) (107,497)
Depreciation and amortization 116,709 101,931 58,293
Property Plant And Equipment Additions 14,900 17,998 21,391
Total Assets 1,251,177 1,579,528 1,827,739
Investments in and advances to unconsolidated companies and other 0 0 8,479
Product and Service, Other [Member]      
Revenue 10,864 9,534 9,314
Operating Segments [Member]      
Gross Profit (37,128) 160 2,324
Operating Segments [Member] | Americas [Member]      
Gross Profit 4,944 (805) 8,860
Depreciation and amortization 32,079 27,493 16,047
Property Plant And Equipment Additions 2,842 969 3,771
Total Assets 338,649 375,297 380,168
Operating Segments [Member] | Middle East and Asia Pacific [Member]      
Gross Profit (5,935) (6,044) (4,417)
Depreciation and amortization 24,244 21,440 11,871
Property Plant And Equipment Additions 2,629 5,237 2,982
Total Assets 226,422 270,413 233,611
Operating Segments [Member] | Europe and Mediterranean [Member]      
Gross Profit (8,629) (1,289) (9,359)
Depreciation and amortization 29,222 30,053 11,385
Property Plant And Equipment Additions 1,059 4,001 185
Total Assets 302,214 358,943 316,524
Operating Segments [Member] | West Africa [Member]      
Gross Profit (27,508) 8,298 7,240
Depreciation and amortization 27,787 21,166 16,612
Property Plant And Equipment Additions 6,028 2,721 10,135
Total Assets 242,825 376,087 483,234
Operating Segments [Member] | Service [Member]      
Revenue 386,174 477,015 397,206
Operating Segments [Member] | Service [Member] | Americas [Member]      
Revenue 126,676 136,958 118,534
Operating Segments [Member] | Service [Member] | Middle East and Asia Pacific [Member]      
Revenue 97,133 90,321 80,195
Operating Segments [Member] | Service [Member] | Europe and Mediterranean [Member]      
Revenue 83,602 123,711 56,263
Operating Segments [Member] | Service [Member] | West Africa [Member]      
Revenue 78,763 126,025 142,214
Operating Segments [Member] | Product and Service, Other [Member]      
Revenue 10,864 9,534 9,314
Gross Profit 7,458 6,734 3,742
Corporate, Non-Segment [Member]      
Corporate expenses (35,633) (57,988) (42,972)
Depreciation and amortization 3,377 1,779 2,378
Property Plant And Equipment Additions 2,342 5,070 4,318
Total Assets $ 141,067 $ 198,788 $ 405,723