Significant Accounting Policies - Impact of Lease Standard Adoption (Details)						1 Months Ended	12 Months Ended
	Dec. 25, 2019 $ / d	Dec. 09, 2018 t $ / d	May 04, 2018 t $ / d	Apr. 28, 2017 t $ / d	Oct. 15, 2015 USD ($)	Nov. 30, 2018 USD ($)	Dec. 31, 2019 USD ($) contract t	Dec. 31, 2018 USD ($) contract	Dec. 31, 2017 contract	Jan. 01, 2019 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Dead weight tonnage of operating fleet | t							2,946,188
Fair value below contract value of time charters acquired								$ 1,800,000
Increase to lease liability							$ 4,500,000
Increase to right-of-use asset							4,500,000
Assets							1,002,087,136	$ 846,209,160
Lease liability							21,557,771
Cash paid for operating leases							$ 14,800,000
Weighted average remaining lease term							20 months 21 days
Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Assets										$ 28,700,000
Lease liability										$ 30,500,000
Letter of Credit
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Restricted cash					$ 74,917
Chartered In Contracts
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of contracts | contract							3
Lease liability							$ 19,597,467
2013 Built Japanese Vessel
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Dead weight tonnage of operating fleet | t				61,400
Charters Agreement Term				4 years
Charters agreement extension option				2 years
2013 Built Japanese Vessel | First Optional Year
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Vessel hire rate (usd per day) | $ / d				13,800
2013 Built Japanese Vessel | Second Optional Year
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Vessel hire rate (usd per day) | $ / d				14,300
2013 Built Japanese Vessel | First Four Years
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Vessel hire rate (usd per day) | $ / d				12,800
Ultramax Vessels
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Dead weight tonnage of operating fleet | t			61,425
Charters Agreement Term			3 years
Charters agreement extension option			2 years
Ultramax Vessels | First Optional Year
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Vessel hire rate (usd per day) | $ / d			13,750
Ultramax Vessels | Second Optional Year
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Vessel hire rate (usd per day) | $ / d			14,750
Ultramax Vessels | First Three Years
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Vessel hire rate (usd per day) | $ / d			12,700
2016 Built Ultramax Vessel
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Dead weight tonnage of operating fleet | t		62,487
Charters Agreement Term			2 years
2016 Built Ultramax Vessel | First Two Years
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Vessel hire rate (usd per day) | $ / d	11,600	14,250
2016 Built Ultramax Vessel | Third Year Option
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Vessel hire rate (usd per day) | $ / d		15,250
Office Building
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of contracts | contract							2	2	2
Lease liability							$ 1,960,304
Office Building | Lease Agreement for Office Space in Stamford
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Average annual rent expense					$ 400,000
Office Building | Singapore Lease Arrangement
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Average annual rent expense						$ 300,000
Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Incremental borrowing rate							5.05%
Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Incremental borrowing rate							6.08%