Consolidated Statements of Operations - USD ($)		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Statement [Abstract]
Revenues, net		$ 275,133,547	$ 292,377,638	$ 310,094,258
Voyage expenses		89,548,796	87,701,407	79,566,452
Vessel operating expenses		86,527,915	82,342,123	81,336,260
Charter hire expenses		21,280,224	42,168,642	38,045,778
Depreciation and amortization		50,157,147	40,545,904	37,717,462
General and administrative expenses		31,532,109	35,041,996	36,156,660
Impairment of operating lease right-of-use assets		352,368	0	0
Other operating expense		0	1,125,000	0
Loss/(gain) on sale of vessels		489,772	(5,978,566)	(335,160)
Total operating expenses, net		279,888,331	282,946,506	272,487,452
Operating (loss)/income		(4,754,784)	9,431,132	37,606,806
Interest expense		35,392,623	30,577,489	25,743,531
Interest income		(257,165)	(1,867,326)	(585,168)
Realized and unrealized (gain)/loss on derivative instruments, net		(4,826,774)	149,632	(126,241)
Loss on debt extinguishment		0	2,268,452	0
Total other expense, net		30,308,684	31,128,247	25,032,122
Net (loss)/income		$ (35,063,468)	$ (21,697,115)	$ 12,574,684
Weighted average shares outstanding*:
Basic (in shares)	[1]	10,310,246	10,195,088	10,095,030
Diluted (in shares)	[1]	10,310,246	10,195,088	10,257,453
Per share amounts:
Basic net (loss)/income (in dollars per share)	[1]	$ (3.40)	$ (2.13)	$ 1.25
Diluted net (loss)/income (in dollars per share)	[1]	$ (3.40)	$ (2.13)	$ 1.23

[1] * Adjusted to give effect for the 1-for-7 Reverse Stock Split that became effective as of September 15, 2020, see Note 1.