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Note 13 - Segment and Geographic Distribution of Operations - Segment Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Revenue $ 89,953 $ 102,344 $ 173,457 $ 218,712
Corporate expenses (110,112) (220,089) (219,917) (354,990)
Long-lived asset impairments 0 (55,482) 0 (65,689)
Affiliate credit loss impairment (expense) credit 1,000 (53,581) 1,000 (53,581)
Affiliate guarantee obligation 0 (2,000) 0 (2,000)
Gain (loss) on asset dispositions, net (932) 1,660 (2,880) 6,991
Operating loss (20,159) (117,745) (46,460) (136,278)
Depreciation and amortization 28,549 28,144 58,276 55,251
Additions to properties and equipment 665 1,626 1,861 4,075
Operating Segments [Member]        
Revenue 89,953 102,344 173,457 218,712
Gross profit (11,157) 568 (28,005) (3,047)
Corporate, Non-Segment [Member]        
Corporate expenses (9,070) (8,910) (16,575) (18,952)
Depreciation and amortization 841 883 1,627 1,744
Additions to properties and equipment 369 710 756 1,288
Americas [Member] | Operating Segments [Member]        
Depreciation and amortization 7,382 8,073 15,389 15,569
Middle East and Asia Pacific [Member] | Operating Segments [Member]        
Depreciation and amortization 6,521 5,645 13,401 11,172
Reductions to properties and equipment (50)   (42)  
Additions to properties and equipment   503   1,183
Europe and Mediterranean [Member] | Operating Segments [Member]        
Depreciation and amortization 7,225 6,793 14,709 13,612
Additions to properties and equipment 287 486 593 926
West Africa [Member] | Operating Segments [Member]        
Depreciation and amortization 6,580 6,750 13,150 13,154
Reductions to properties and equipment   (73)    
Additions to properties and equipment 59   554 678
Vessel [Member]        
Revenue 88,514 100,975 169,507 212,949
Vessel [Member] | Americas [Member] | Operating Segments [Member]        
Revenue 23,481 34,044 49,705 65,903
Gross profit (4,940) 4,505 (6,591) 3,341
Vessel [Member] | Middle East and Asia Pacific [Member] | Operating Segments [Member]        
Revenue 25,628 23,983 50,042 48,811
Gross profit 266 599 (1,587) (257)
Vessel [Member] | Europe and Mediterranean [Member] | Operating Segments [Member]        
Revenue 22,467 20,620 37,216 50,111
Gross profit (1,986) (1,750) (10,007) (203)
Vessel [Member] | West Africa [Member] | Operating Segments [Member]        
Revenue 16,938 22,328 32,544 48,124
Gross profit (5,355) (3,984) (12,122) (8,847)
Product and Service, Other [Member]        
Revenue 1,439 1,369 3,950 5,763
Product and Service, Other [Member] | Operating Segments [Member]        
Revenue 1,439 1,369 3,950 5,763
Gross profit $ 858 $ 1,198 $ 2,302 $ 2,919