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Note 4 - Investment in Unconsolidated Affiliates (Details Textual)
$ in Thousands
 3 Months Ended 12 Months Ended
Apr. 22, 2021
USD ($)
Jun. 22, 2020
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Jan. 01, 2022
Due from Affiliate, Current       $ 70,134 $ 62,050    
Assets, Current, Total       342,672 388,649    
Accounts Receivable, Credit Loss Expense (Reversal)       400 52,981 $ 0  
Due to Affiliate, Current       61,555 53,194    
Revenue from Contract with Customer, Excluding Assessed Tax, Total       371,033 397,038 486,549  
Sonatide Marine Ltd [Member]              
Dividends, Total     $ 35,000        
Sonatide Marine Ltd [Member] | Subsequent Event [Member]              
Business Acquisition, Percentage of Voting Interests Acquired             51.00%
Sonatide Marine Ltd [Member]              
Due from Affiliate, Current       49,000 41,600    
Proceeds from Dividends Received   $ 17,200          
Cash, Ending Balance       10,200      
Accounts Receivable, after Allowance for Credit Loss, Current, Total       10,600      
Assets, Current, Total       20,800      
Accounts Receivable, Credit Loss Expense (Reversal)       400 40,900 $ (0)  
Due to Affiliate, Current       $ 40,400 $ 32,800    
Number of Stacked Vessels         2    
Sonatide Marine Ltd [Member] | ANGOLA              
Number of Stacked Vessels       5 6 13  
Revenue from Contract with Customer, Excluding Assessed Tax, Total       $ 43,200 $ 45,300 $ 52,100  
Sales Revenue Services Percentage       11.90% 11.70% 10.90%  
Number of Vessels       24 23 32  
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%      
Equity Method Investment, Ownership Percentage by Other Owners       60.00%      
Secured Long-term Debt, Noncurrent         4,700    
Guarantor Obligations, Maximum Exposure, Undiscounted         $ 2,000    
Payments To Settle Debt Guarantee $ 2,000