Basis of Presentation and General Information (Details)		6 Months Ended
	Sep. 15, 2020	Jun. 30, 2021 USD ($) vessel segment t $ / shares shares	Jun. 30, 2020 USD ($)	Mar. 31, 2021 USD ($) $ / shares	Dec. 31, 2020 $ / shares	May 04, 2018 t
Property, Plant and Equipment [Line Items]
Number of business segments | segment		1
Number of vessels		51
Dead weight tonnage of operating fleet | t		3,056,772
Average age of operating fleet		9 years
Reverse stock split ratio	0.1429
Common stock, par value (in dollars per share) | $ / shares		$ 0.01			$ 0.01
Net proceeds from issuance of stock | $		$ 27,372,417	$ 0
ATM Offering
Property, Plant and Equipment [Line Items]
Consideration authorized | $				$ 50,000,000.0
Shares issued (in shares) | shares		581,385
Weighted-average sales price (in dollars per share) | $ / shares		$ 47.97
Common stock, par value (in dollars per share) | $ / shares				$ 0.01
Net proceeds from issuance of stock | $		$ 27,300,000
2013 Built Ultramax Vessel
Property, Plant and Equipment [Line Items]
Dead weight tonnage of operating fleet | t						61,425
Number of vessels charted-in		3
Remaining lease term		1 year
Supramax Vessels
Property, Plant and Equipment [Line Items]
Vessels in operation		27
Ultramax Vessels
Property, Plant and Equipment [Line Items]
Vessels in operation		24