Derivative Instruments (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Level 2 | Derivatives not designated as hedging instruments
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives not designated as hedging instruments, location of (gain)/loss recognized	$ 163,105	$ (740,356)	$ (2,275,150)	$ (639,977)
FFAs | Other current assets
Derivative Instruments, Gain (Loss) [Line Items]
Collateral related to derivative instruments under collateral security arrangements	1,500,000		1,500,000		$ 800,000
FFAs | Level 2 | Derivatives not designated as hedging instruments | Other current assets
Derivative Instruments, Gain (Loss) [Line Items]
Derivative asset	1,545,840		1,545,840		669,240
FFAs | Level 2 | Other expense/(income) | Derivatives not designated as hedging instruments
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives not designated as hedging instruments, location of (gain)/loss recognized	39,296	36,625	(1,130,993)	82,432
Bunker Swaps | Derivatives not designated as hedging instruments | Fair value of derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Derivative liability	65,850		65,850		929,313
Bunker Swaps | Level 2 | Derivatives not designated as hedging instruments | Other current assets
Derivative Instruments, Gain (Loss) [Line Items]
Derivative asset	211,357		211,357		$ 0
Bunker Swaps | Level 2 | Other expense/(income) | Derivatives not designated as hedging instruments
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives not designated as hedging instruments, location of (gain)/loss recognized	$ 123,809	$ (776,981)	$ (1,144,157)	$ (722,409)