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Note 5 - Investment in Unconsolidated Affiliates (Details Textual)
$ in Thousands, Kz in Millions
 3 Months Ended 12 Months Ended
Jun. 22, 2020
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2020
AOA (Kz)
Due from Affiliate, Current     $ 62,050 $ 125,972    
Assets, Current, Total     388,649 537,296    
Asset Impairment Charges, Total     74,109 37,773 $ 61,132  
Accounts Receivable, Credit Loss Expense (Reversal)     52,981 0 0  
Due to Affiliate, Current     53,194 50,186    
Revenue from Contract with Customer, Excluding Assessed Tax, Total     397,038 486,549 406,520  
Sonatide Marine Ltd [Member]            
Dividends, Total   $ 35,000        
Cash, Ending Balance     9,400     Kz 1.6
Accounts Receivable, after Allowance for Credit Loss, Current, Total     9,800      
Assets, Current, Total     19,200      
Sonatide Marine Ltd [Member]            
Due from Affiliate, Current     41,600 89,200    
Proceeds from Dividends Received $ 17,200          
Asset Impairment Charges, Total         20,000  
Accounts Receivable, Credit Loss Expense (Reversal)     40,900 (0) $ 20,083  
Due to Affiliate, Current     $ 32,800 $ 31,500    
Number of Stacked Vessels     2      
Sonatide Marine Ltd [Member] | ANGOLA            
Number of Stacked Vessels     6 13 16  
Revenue from Contract with Customer, Excluding Assessed Tax, Total     $ 45,300 $ 52,100 $ 59,000  
Sales Revenue Services Percentage     11.70% 10.90% 15.00%  
Number of Vessels     23 32 37  
Sonatide Marine Ltd [Member] | Sonangol [Member]            
Proceeds from Dividends Received $ 17,800          
DTDW [Member]            
Accounts Receivable, Credit Loss Expense (Reversal)     $ 12,100      
Number of Vessels     1      
Equity Method Investment, Ownership Percentage     40.00%     40.00%
Equity Method Investment, Ownership Percentage by Other Owners     60.00%     60.00%
Secured Long-term Debt, Noncurrent     $ 4,700      
Guarantor Obligations, Maximum Exposure, Undiscounted     $ 2,000