Variable Interest Entities (Details)	Dec. 31, 2022 USD ($) vessel	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Variable Interest Entity [Line Items]
Total assets	$ 748,241,470	$ 707,024,006
Total stockholders' equity	$ 368,721,530	300,681,394	$ 234,431,405
NBP
Variable Interest Entity [Line Items]
Number of newbuilding vessels | vessel	4
Variable Interest Entity | Ship-owning (1)
Variable Interest Entity [Line Items]
Total assets	$ 116,600,000	129,400,000
Carrying amount, liabilities	123,400,000	135,600,000
Total stockholders' equity	(6,800,000)	(6,200,000)
Noncontrolling interest in variable interest entity	0	0
Variable Interest Entity | NBC
Variable Interest Entity [Line Items]
Total assets	62,300,000	72,900,000
Carrying amount, liabilities	30,200,000	50,600,000
Total stockholders' equity	32,100,000	22,400,000
Noncontrolling interest in variable interest entity	0	0
Variable Interest Entity | Long Wharf
Variable Interest Entity [Line Items]
Total assets	1,900,000	1,900,000
Carrying amount, liabilities	1,900,000	2,000,000.0
Total stockholders' equity	0	0
Noncontrolling interest in variable interest entity	0	0
Variable Interest Entity | VLNL
Variable Interest Entity [Line Items]
Total assets	500,000	900,000
Carrying amount, liabilities	0	0
Total stockholders' equity	500,000	900,000
Noncontrolling interest in variable interest entity	1,200,000	1,400,000
Variable Interest Entity | NBP
Variable Interest Entity [Line Items]
Total assets	152,000,000.0	161,200,000
Carrying amount, liabilities	143,900,000	146,600,000
Total stockholders' equity	8,100,000	14,600,000
Noncontrolling interest in variable interest entity	0	0
Variable Interest Entity | Nordic Bulk Holding Company Ltd.
Variable Interest Entity [Line Items]
Total assets	128,100,000	123,900,000
Carrying amount, liabilities	57,800,000	57,400,000
Total stockholders' equity	70,300,000	66,500,000
Noncontrolling interest in variable interest entity	$ 53,300,000	$ 52,000,000.0