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Note 7 - Affiliates Balances (Details Textual)
$ in Thousands, Kz in Millions
3 Months Ended 9 Months Ended
Jun. 22, 2020
USD ($)
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
AOA (Kz)
Accounts Receivable, Credit Loss Expense (Reversal)   $ 0   $ 0 $ 53,581 $ 0  
Number of Vessels   146     146   146
Sonatide [Member]              
Proceeds from Dividends Received $ 17,200            
Accounts Receivable, Credit Loss Expense (Reversal)         $ 41,500    
Number of Vessels   2     2   2
DTDW [Member]              
Accounts Receivable, Credit Loss Expense (Reversal)         $ 12,100    
Number of Vessels   1     1   1
Equity Method Investment, Ownership Percentage   40.00%     40.00%   40.00%
Equity Method Investment, Ownership Percentage by Other Owners   60.00%     60.00%   60.00%
Secured Long-term Debt, Noncurrent   $ 4,700     $ 4,700    
Guarantor Obligations, Maximum Exposure, Undiscounted   2,000     2,000    
Sonatide [Member]              
Dividends, Total     $ 35,000        
Due From Affiliate, Net of Due to Affiliate   12,300     12,300    
Cash, Ending Balance   8,900     8,900   Kz 1
Accounts Receivable, after Allowance for Credit Loss, Current, Total   $ 12,900     $ 12,900    
Sonatide [Member] | Sonatide [Member]              
Proceeds from Dividends Received $ 17,800