General Information (Details) $ / shares in Units, $ in Millions		12 Months Ended
	Dec. 22, 2020 USD ($) vessel shares	Dec. 31, 2020 vessel segment t $ / shares	Sep. 15, 2020 $ / shares	Dec. 31, 2019 $ / shares
Property, Plant and Equipment [Line Items]
Number of operating segments | segment		1
Number of reportable segments | segment		1
Issuance of common shares for Equity Offering (in shares) | shares	1,381,215
Proceeds from Issuance of Common Stock | $	$ (23.5)
Number of vessels	2	45
Common stock, par value (in dollars per share) | $ / shares		$ 0.01	$ 0.01	$ 0.01
Carrying capacity (in dead weight tonnage) | t		2,686,570
Average age of operating fleet		8 years 9 months 18 days
Reverse stock split	0.1429
Supramax Vessels
Property, Plant and Equipment [Line Items]
Vessels owned and operated		25
Ultramax Vessels
Property, Plant and Equipment [Line Items]
Vessels owned and operated		20
Vessels chartered in		3