Derivative Instruments and Fair Value Measurements - Effect of Non-designated Derivative Instruments (Details) - Derivatives not designated as hedging instruments - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Amount of (gain)/loss	$ (126,241)	$ (37,905)	$ 561,495
FFAs | Fair value of derivatives
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Derivative liability	0	73,170
FFAs | Other current assets
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Derivative asset	669,240	0
Bunker swaps | Fair value of derivatives
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Derivative liability	929,313	0
Bunker swaps | Other current assets
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Derivative asset	0	128,845
Other (income)/expense | FFAs
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Amount of (gain)/loss	(471,679)	375,672	561,495
Other (income)/expense | Bunker swaps
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Amount of (gain)/loss	$ 345,438	$ (413,577)	$ 0