Recent Accounting Pronouncements - Additional Information (Details)						1 Months Ended	3 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 ($)	Nov. 30, 2018 USD ($)	Mar. 31, 2020 USD ($) contract t	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)	Jan. 01, 2019 USD ($)	Dec. 31, 2018 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of contracts | contract							5
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
Operating lease right-of-use assets							$ 17,185,019		20,410,037	$ 20,410,037
Operating lease, liability							18,167,305
Cash paid on operating leases							$ 3,600,000	$ 3,700,000
Weighted average remaining lease term							17 years 6 months
Revenue earned as demurrage							$ 74,378,319	77,389,597
Deferred costs							600,000
Allowance for credit loss							2,800,000		$ 2,500,000
Voyage In Progress [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue earned as demurrage							$ 1,900,000	$ 3,700,000
Letter of Credit
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Restricted cash, cash equivalents					$ 74,917
Chartered-in contracts greater than 12 months
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of contracts | contract							3
Operating lease right-of-use assets							$ 15,370,956			18,442,965
Operating lease, liability							$ 16,360,010
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 term, extension option				2 years
2013 Built Japanese Vessel | First Four Years
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Vessel hiring rate (in dollars per day) | $ / d				12,800
2013 Built Japanese Vessel | First Optional Year
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Vessel hiring rate (in dollars per day) | $ / d				13,800
2013 Built Japanese Vessel | Second Optional Year
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Vessel hiring rate (in dollars per day) | $ / d				14,300
2013 Built Ultramax Vessel
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Dead weight tonnage of operating fleet | t			61,425
Charters agreement term			3 years				2 years
Charters agreement term, extension option			2 years
2013 Built Ultramax Vessel | First Optional Year
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Vessel hiring rate (in dollars per day) | $ / d			13,750
2013 Built Ultramax Vessel | Second Optional Year
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Vessel hiring rate (in dollars per day) | $ / d			14,750
2013 Built Ultramax Vessel | First Three Years
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Vessel hiring rate (in dollars 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 hiring rate (in dollars 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 hiring rate (in dollars per day) | $ / d		15,250
Office leases
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of contracts | contract							2
Operating lease right-of-use assets							$ 1,814,063			$ 1,967,072
Operating lease, liability							$ 1,807,295
Office leases | Lease Agreement for Office Space in Stamford
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Average annual rent expense					$ 400,000
Office leases | 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]
Operating lease, term of contract							30 days
Incremental borrowing rate							5.05%
Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease, term of contract							2 years
Incremental borrowing rate							6.08%