Deferred Drydock Costs (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Changes in Deferred Drydock Costs [Roll Forward]
Beginning Balance	$ 11,507,309	$ 11,146,009	$ 1,960,792
Drydocking costs	2,579,111	3,688,711	11,141,561
Drydock amortization	(4,336,669)	(3,327,411)	(1,956,344)
Ending Balance	$ 9,749,751	$ 11,507,309	$ 11,146,009