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Long Term Debt - Additional Information (Details)
1 Months Ended 12 Months Ended
Dec. 31, 2021
USD ($)
vessel
item
facility
Sep. 30, 2021
USD ($)
vessel
Aug. 31, 2021
Jun. 30, 2021
USD ($)
vessel
Apr. 30, 2021
Feb. 28, 2021
Dec. 31, 2021
USD ($)
vessel
item
facility
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
tranche
Debt Instrument [Line Items]                    
Number of facilities that entered into a sale and leaseback agreement | facility 11           11      
Number of vessels sold and leased back | vessel             11      
Number of facilities repaid during period | facility             2      
Proceeds from long-term debt             $ 178,800,000 $ 92,400,000 $ 177,575,000  
Number of vessels provided as collateral | item 23           23      
Fair value of debt outstanding $ 362,427,000           $ 362,427,000      
Borrowing capacity outstanding $ 137,700,000           137,700,000      
Interest costs incurred             14,776,000 21,417,000 26,929,000  
Interest costs capitalized             $ 57,000 $ 184,000 $ 114,000  
Line of credit | Revolving Credit Facility                    
Debt Instrument [Line Items]                    
Maximum borrowing capacity   $ 30,000,000                
All Debt Instruments                    
Debt Instrument [Line Items]                    
Weighted average interest rate 2.642%           2.642% 3.382% 4.624%  
Net worth covenant $ 150,000,000           $ 150,000,000      
Minimum EBITDA to interest expense 2.0           2.0      
All Debt Instruments | Threshold one                    
Debt Instrument [Line Items]                    
Minimum value covenant 1.05           1.05      
All Debt Instruments | Threshold two                    
Debt Instrument [Line Items]                    
Minimum value covenant 1.15           1.15      
All Debt Instruments | Threshold three                    
Debt Instrument [Line Items]                    
Minimum value covenant 1.20           1.20      
All Debt Instruments | Threshold four                    
Debt Instrument [Line Items]                    
Minimum value covenant 1.35           1.35      
Commercial financing institutions                    
Debt Instrument [Line Items]                    
Consolidated leverage covenant 85.00%           85.00%      
Minimum | All Debt Instruments                    
Debt Instrument [Line Items]                    
Mininum cash balance of loan and credit facility agrrements as collateral deposit with restrictive liquidity covenant $ 200,000           $ 200,000      
Maximum | All Debt Instruments                    
Debt Instrument [Line Items]                    
Mininum cash balance of loan and credit facility agrrements as collateral deposit with restrictive liquidity covenant $ 500,000           $ 500,000      
Hajioannou Family | One facility                    
Debt Instrument [Line Items]                    
Minimum percentage of ownership 20.00%           20.00%      
Hajioannou Family | Minimum | All Debt Instruments                    
Debt Instrument [Line Items]                    
Minimum percentage of ownership 30.00%           30.00%      
Hajioannou Family | Maximum | All Debt Instruments                    
Debt Instrument [Line Items]                    
Minimum percentage of ownership 35.00%           35.00%      
Shikokutessera                    
Debt Instrument [Line Items]                    
Sale leaseback lease term             8 years      
Shikokutessera, Maxdeka, Shikoku and Glovertwo                    
Debt Instrument [Line Items]                    
Sale leaseback, repurchase period             5 years 9 months      
Number of vessels sold and leased back | vessel             4      
Shikokuokto and Gloversix                    
Debt Instrument [Line Items]                    
Sale leaseback lease term             8 years      
Sale leaseback, repurchase period             3 years      
Sale leaseback transaction, purchase obligation             8 years      
Pentakomo and Maxdekatria                    
Debt Instrument [Line Items]                    
Sale leaseback lease term             6 years      
Sale leaseback, repurchase period             3 years      
Sale leaseback transaction, purchase obligation             6 years      
Pinewood                    
Debt Instrument [Line Items]                    
Sale leaseback lease term           10 years        
Sale leaseback, repurchase period           3 years        
Sale leaseback transaction, purchase obligation           10 years        
Maxtessera                    
Debt Instrument [Line Items]                    
Sale leaseback lease term         7 years          
Sale leaseback, repurchase period         5 years 6 months          
Shikokuepta                    
Debt Instrument [Line Items]                    
Sale leaseback lease term     10 years              
Sale leaseback, repurchase period     3 years              
Sale leaseback transaction, purchase obligation     10 years              
Maxeikosiena and Youngtwo                    
Debt Instrument [Line Items]                    
Sale leaseback lease term             10 years      
Sale leaseback, repurchase period             2 years      
Sale leaseback transaction, purchase obligation             10 years      
Agros                    
Debt Instrument [Line Items]                    
Sale leaseback lease term             10 years      
Sale leaseback, repurchase period             3 years      
Sale leaseback transaction, purchase obligation             10 years      
Maximum borrowing capacity $ 26,200,000           $ 26,200,000      
Pelea, Vasstwo, Eniaprohi and Vassone                    
Debt Instrument [Line Items]                    
Maximum borrowing capacity                   $ 47,750,000
Line of credit facility, number of tranches | tranche                   2
Proceeds from long-term debt                 $ 24,675,000 $ 23,075,000
Monagrouli                    
Debt Instrument [Line Items]                    
Maximum borrowing capacity               $ 26,400,000    
Lofou                    
Debt Instrument [Line Items]                    
Maximum borrowing capacity 30,000,000           30,000,000 20,000,000    
Long-term line of credit 0           0      
Unused borrowing capacity 30,000,000           $ 30,000,000      
Lofou | Line of credit                    
Debt Instrument [Line Items]                    
Maximum borrowing capacity               $ 20,000,000    
Maxdeka, Shikoku and Glovertwo                    
Debt Instrument [Line Items]                    
Sale leaseback lease term             7 years 6 months      
Eptaprohi, Soffive, Marinouki, Marathassa, Kerasies, Pemer and Petra | Line of credit                    
Debt Instrument [Line Items]                    
Maximum borrowing capacity       $ 70,000,000            
Proceeds from long-term debt       $ 64,345,000            
Long-term line of credit 10,000,000           $ 10,000,000      
Unused borrowing capacity 27,700,000           27,700,000      
Number of vessels financed by credit facility | vessel       8            
Number of vessels provided as collateral | vessel       7            
Number of vessels debt free | vessel       1            
Eptaprohi, Soffive, Marinouki, Marathassa, Kerasies, Pemer and Petra | Line of credit | Secured debt                    
Debt Instrument [Line Items]                    
Maximum borrowing capacity       $ 30,000,000            
Eptaprohi, Soffive, Marinouki, Marathassa, Kerasies, Pemer and Petra | Line of credit | Revolving Credit Facility                    
Debt Instrument [Line Items]                    
Maximum borrowing capacity       $ 40,000,000            
Eniadefhi, Maxdodeka, Gloverfour, Gloverfive and Youngone | Line of credit                    
Debt Instrument [Line Items]                    
Maximum borrowing capacity   $ 60,000,000                
Long-term line of credit 0           0      
Unused borrowing capacity 30,000,000           30,000,000      
Number of vessels financed by credit facility | vessel   6                
Number of vessels provided as collateral | vessel   5                
Eniadefhi, Maxdodeka, Gloverfour, Gloverfive and Youngone | Line of credit | Secured debt                    
Debt Instrument [Line Items]                    
Maximum borrowing capacity   $ 30,000,000                
Proceeds from long-term debt   71,139,000                
Eniadefhi, Maxdodeka, Gloverfour, Gloverfive and Youngone | Line of credit | Revolving Credit Facility                    
Debt Instrument [Line Items]                    
Maximum borrowing capacity   30,000,000                
Proceeds from long-term debt   $ 7,000,000                
Youngtwo, Shikokupente, Maxeikositessera, Maxenteka and Shikokuennia | Line of credit                    
Debt Instrument [Line Items]                    
Maximum borrowing capacity 100,000,000           100,000,000      
Proceeds from long-term debt 50,000,000                  
Long-term line of credit 0           0      
Unused borrowing capacity $ 50,000,000           $ 50,000,000      
Number of vessels financed by credit facility | vessel 5           5      
Youngtwo, Shikokupente, Maxeikositessera, Maxenteka and Shikokuennia | Line of credit | Secured debt                    
Debt Instrument [Line Items]                    
Maximum borrowing capacity $ 50,000,000           $ 50,000,000      
Youngtwo, Shikokupente, Maxeikositessera, Maxenteka and Shikokuennia | Line of credit | Revolving Credit Facility                    
Debt Instrument [Line Items]                    
Maximum borrowing capacity $ 50,000,000           $ 50,000,000