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Variable Interest Entities (Details)
Dec. 31, 2020
USD ($)
vessel
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Variable Interest Entity [Line Items]      
Total assets $ 450,404,145 $ 479,902,831  
Total stockholders' equity 234,431,405 243,071,674 $ 233,366,997
Ship-owning (1) | Variable Interest Entity      
Variable Interest Entity [Line Items]      
Total assets 100,900,000 89,500,000  
Carrying amount, liabilities 100,800,000 116,600,000  
Total stockholders' equity 0 (27,000,000.0)  
Noncontrolling interest in variable interest entity 0 0  
NBC | Variable Interest Entity      
Variable Interest Entity [Line Items]      
Total assets 37,200,000 54,000,000.0  
Carrying amount, liabilities 24,500,000 40,900,000  
Total stockholders' equity 12,700,000 13,100,000  
Noncontrolling interest in variable interest entity 0 0  
Long Wharf | Variable Interest Entity      
Variable Interest Entity [Line Items]      
Total assets 2,000,000.0 2,000,000.0  
Carrying amount, liabilities 2,100,000 2,200,000  
Total stockholders' equity (100,000) (100,000)  
Noncontrolling interest in variable interest entity 0 0  
VLNL | Variable Interest Entity      
Variable Interest Entity [Line Items]      
Total assets 1,300,000 1,900,000  
Carrying amount, liabilities 100,000 200,000  
Total stockholders' equity 1,300,000 1,700,000  
Noncontrolling interest in variable interest entity $ 1,600,000 1,800,000  
NBP (3)      
Variable Interest Entity [Line Items]      
Number of newbuilding vessels | vessel 4    
NBP (3) | Variable Interest Entity      
Variable Interest Entity [Line Items]      
Total assets $ 19,700,000 19,100,000  
Carrying amount, liabilities 5,100,000 4,800,000  
Total stockholders' equity 14,600,000 14,300,000  
Noncontrolling interest in variable interest entity 0 0  
Nordic Bulk Holding Company Ltd. | Variable Interest Entity      
Variable Interest Entity [Line Items]      
Total assets 129,300,000 147,000,000.0  
Carrying amount, liabilities 68,700,000 67,900,000  
Total stockholders' equity 60,600,000 79,100,000  
Noncontrolling interest in variable interest entity $ 50,100,000 $ 71,000,000.0