Derivative Instruments and Fair Value Measurements - Additional Information (Details) - USD ($)	1 Months Ended	3 Months Ended		6 Months Ended
	Jan. 31, 2020	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Purchase of derivative instrument				$ 628,000	$ 0
Unrealized loss (gain) on derivative instruments		$ (1,404,317)	$ (215,171)	1,512,777	(2,504,957)
Freight forward agreements
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative gain (loss)		104,000	557,000	118,170	117,000
Fuel swaps
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative gain (loss)		1,364,000	$ (342,000)	(1,187,000)	$ 2,388,000
Recurring | Freight forward agreements
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Fair value, net assets (liabilities)		(31,590)		(31,590)		$ (149,760)
Recurring | Fuel swaps | Fuel
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Fair value, net assets (liabilities)		(1,509,429)		(1,509,429)		(322,313)
Level 2 | Recurring | Freight forward agreements
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Fair value (other liabilities)		(31,590)		(31,590)		(150,000)
Fair value, net assets (liabilities)		(31,590)		(31,590)		(149,760)
Level 2 | Recurring | Fuel swaps | Fuel
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Fair value, net assets (liabilities)		(1,509,429)		(1,509,429)		$ (322,313)
Interest Rate Cap
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Purchase of derivative instrument	$ 628,000
Unrealized loss (gain) on derivative instruments		$ 63,921		$ 443,831