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Note 8 - Affiliates Balances (Details Textual)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jan. 31, 2022
USD ($)
Jun. 30, 2022
USD ($)
Dec. 31, 2021
Jun. 30, 2022
USD ($)
Jun. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
Jan. 01, 2022
Business Combination, Bargain Purchase, Gain Recognized, Amount       $ 1,300 $ (0)    
Number of Vessels     135 187      
DTDW [Member]              
Equity Method Investment, Ownership Percentage by Other Owners   60.00%   60.00%      
Equity Method Investment, Ownership Percentage   40.00%   40.00%      
Number of Vessels       1      
Sonatide [Member]              
Equity Method Investment, Ownership Percentage by Other Owners     51.00%     51.00%  
Sonatide [Member]              
Business Combination, Step Acquisition, Equity Interest in Acquiree, Percentage     49.00%     49.00%  
Business Acquisition, Percentage of Voting Interests Acquired             51.00%
Payments to Acquire Businesses, Gross $ 11,200            
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual   $ 1,000   $ 2,000      
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual   $ 200   100      
Business Combination, Bargain Purchase, Gain Recognized, Amount $ 1,300            
Business Acquisition, Pro Forma Revenue           $ 375,400  
Business Acquisition, Pro Forma Net Income (Loss)           $ 129,200  
Sonatide [Member] | Interest Income and Other, Net [Member]              
Business Combination, Bargain Purchase, Gain Recognized, Amount       $ 1,300