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Significant Accounting Policies, Revenue Recognition (Details)
$ in Thousands
12 Months Ended 36 Months Ended
Dec. 31, 2021
USD ($)
Agreement
Dec. 31, 2020
USD ($)
Vessel
Dec. 31, 2019
USD ($)
Dec. 31, 2020
USD ($)
Agreement
Revenue Recognition [Abstract]        
Demurrage income $ 800 $ 819 $ 1,528  
Despatch expense $ 110 $ 133 432  
Revenue Recognition [Abstract]        
Number of long-term employment agreements | Agreement 17      
Number of long-term employment agreements agreed to | Agreement 9     8
Number of vessels having scrubbers installed | Vessel   6    
Deferred revenue, current $ 7,735 $ 4,510   $ 4,510
Deferred revenue, non-current 538 2,773   2,773
Vessel revenues, net of commissions 153,108 63,345 86,499  
Accounts receivable trade, net 0 801   801
Deferred revenue recognized 4,105      
Scrubber Increased Daily Rates [Member]        
Revenue Recognition [Abstract]        
Deferred revenue 2,773      
Deferred revenue, current 2,235 3,155   3,155
Deferred revenue, non-current 538 2,773   2,773
Spot Charter [Member]        
Revenue Recognition [Abstract]        
Vessel revenues, net of commissions 28,264 27,033 55,701  
Accounts receivable trade, net 0 801   801
Time Charter [Member]        
Revenue Recognition [Abstract]        
Vessel revenues, net of commissions 124,844 36,312 $ 30,798  
Accounts receivable trade, net $ 0 $ 0   $ 0
Revenues [Member] | Customer Concentration Risk [Member] | Customers Accounting for More than 10 Percent [Member]        
Revenue [Abstract]        
Concentration risk percentage 72.00% 41.00% 52.00%  
Revenues [Member] | Customer Concentration Risk [Member] | Customer A [Member]        
Revenue [Abstract]        
Concentration risk percentage 23.00% 23.00% 0.00%  
Revenues [Member] | Customer Concentration Risk [Member] | Customer B [Member]        
Revenue [Abstract]        
Concentration risk percentage 15.00% 0.00% 0.00%  
Revenues [Member] | Customer Concentration Risk [Member] | Customer C [Member]        
Revenue [Abstract]        
Concentration risk percentage 13.00% 0.00% 0.00%  
Revenues [Member] | Customer Concentration Risk [Member] | Customer D [Member]        
Revenue [Abstract]        
Concentration risk percentage 11.00% 18.00% 15.00%  
Revenues [Member] | Customer Concentration Risk [Member] | Customer E [Member]        
Revenue [Abstract]        
Concentration risk percentage 0.00% 0.00% 19.00%  
Revenues [Member] | Customer Concentration Risk [Member] | Customer F [Member]        
Revenue [Abstract]        
Concentration risk percentage 0.00% 0.00% 18.00%  
Revenues [Member] | Customer Concentration Risk [Member] | Customer G [Member]        
Revenue [Abstract]        
Concentration risk percentage 10.00% 0.00% 0.00%