Basis of Presentation and General Information (Details)	3 Months Ended	9 Months Ended
	Jun. 30, 2021 USD ($) $ / shares shares	Sep. 30, 2021 USD ($) bank segment vessel t $ / shares	Sep. 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 | vessel		52
Dead weight tonnage of operating fleet | t		3,128,107
Average age of operating fleet		9 years 1 month 6 days
Common stock, par value (in dollars per share)		$ 0.01			$ 0.01
Net proceeds from issuance of stock | $	$ 27,200,000	$ 27,242,417	$ 0
ATM Offering
Property, Plant and Equipment [Line Items]
Common stock, par value (in dollars per share)				$ 0.01
Consideration authorized | $				$ 50,000,000
Shares issued (in shares) | shares	581,385
Weighted-average sales price (in dollars per share)	$ 47.97
2013 Built Ultramax Vessel
Property, Plant and Equipment [Line Items]
Dead weight tonnage of operating fleet | t						61,425
Number of vessels charted-in | vessel		4
Remaining lease term		1 year
Supramax Vessels
Property, Plant and Equipment [Line Items]
Vessels in operation | bank		27
Ultramax Vessels
Property, Plant and Equipment [Line Items]
Vessels in operation | bank		25