Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash flows from operating activities:
Net (loss)/income	$ (35,063,468)	$ (21,697,115)	$ 12,574,684
Adjustments to reconcile net (loss)/income to net cash provided by operating activities:
Depreciation	42,778,395	34,318,053	32,364,359
Amortization of deferred drydocking costs	7,378,752	6,227,851	5,353,102
Amortization of operating lease right-of-use assets	12,516,798	12,764,596	0
Amortization of debt discount and debt issuance costs	6,272,309	3,783,939	1,913,651
Loss on debt extinguishment	0	2,268,452	0
Amortization of fair value below contract value of time charter acquired	0	0	(681,898)
Loss/(gain) on sale of vessels	489,772	(5,978,566)	(335,160)
Impairment of operating lease right-of-use assets	352,368	0	0
Net unrealized (gain)/loss on fair value of derivatives	(536,935)	(75,537)	315,748
Stock-based compensation expense	3,048,280	4,826,324	9,207,480
Drydocking expenditures	(14,293,562)	(11,903,474)	(8,323,191)
Changes in operating assets and liabilities:
Accounts payable	(4,170,779)	3,199,113	993,557
Accounts receivable	1,917,765	(6,902)	(3,465,025)
Accrued interest	(630,954)	3,585,458	(54,684)
Inventories	4,199,445	313,507	(2,024,706)
Operating lease liabilities current and noncurrent	(13,255,978)	(13,475,534)	0
Other current and non-current assets	(228,992)	1,503,904	(207,234)
Other accrued liabilities and other non-current liabilities	(3,006,946)	4,261,774	(1,125,638)
Prepaid expenses	1,448,601	4,463	(1,625,113)
Unearned revenue	3,380,036	(2,234,580)	590,531
Net cash provided by operating activities	12,594,907	21,685,726	45,470,463
Cash flows from investing activities:
Purchases of vessels and vessel improvements	(979,612)	(143,477,720)	(41,404,328)
Advances for vessel purchases	(3,250,000)	0	(2,040,000)
Purchase of scrubbers and ballast water treatment systems	(28,376,566)	(58,196,164)	(12,342,317)
Proceeds from hull and machinery insurance claims	3,943,667	3,845,967	0
Proceeds from redemption of a short-term investment	0	0	4,500,000
Proceeds from sale of vessels	23,224,650	29,560,746	20,545,202
Purchase of other fixed assets	(53,794)	(351,434)	(272,067)
Net cash used in investing activities	(5,491,655)	(168,618,605)	(31,013,510)
Cash flows from financing activities:
Financing costs paid to lenders		(3,533,770)	0
Other financing costs	(141,634)	(1,655,353)	(2,465,037)
Proceeds from issuance of common stock	23,497,854	0	0
Cash received from exercise of stock options	0	0	4,865
Cash used to settle fractional shares	(12,513)	0	0
Cash used to settle net share equity awards	(1,162,609)	(1,443,753)	(2,559,104)
Net cash provided by financing activities	22,615,234	127,899,526	7,380,724
Net increase/(decrease) in cash, cash equivalents and restricted cash	29,718,486	(19,033,353)	21,837,677
Cash, cash equivalents and restricted cash at beginning of year	59,130,285	78,163,638	56,325,961
Cash, cash equivalents and restricted cash at end of year	88,848,771	59,130,285	78,163,638
Supplemental cash flow information:
Accruals for scrubbers and ballast water treatment systems in Accounts payable and Other accrued liabilities	3,154,693	16,380,168	5,801,867
Accruals for equity issuance costs included in Accounts payable and Other accrued liabilities	260,000	0	0
Cash paid during the period for interest	29,603,965	23,208,093	23,884,565
New First Lien Facility
Cash flows from financing activities:
Repayments of lines of credit	0	(5,000,000)	(5,000,000)
New First Lien Facility | Revolver Loan
Cash flows from financing activities:
Proceeds from long term debt	0	5,000,000	0
New First Lien Facility | Term Loan
Cash flows from financing activities:
Repayments of long-term debt	0	(60,000,000)	0
Convertible Debt Securities
Cash flows from financing activities:
Proceeds from long term debt	0	112,482,586	0
Norwegian Bond Debt
Cash flows from financing activities:
Repayments of long-term debt	(8,000,000)	(8,000,000)	(4,000,000)
New Ultraco Debt Facility
Cash flows from financing activities:
Proceeds from long term debt		187,760,000	0
Repayments of long-term debt	(28,734,393)	(15,146,013)	0
Original Ultraco Debt Facility
Cash flows from financing activities:
Proceeds from long term debt	0	0	21,400,000
Repayments of long-term debt	0	(82,600,000)	0
Share Lending Agreement
Cash flows from financing activities:
Proceeds from long term debt	0	35,829	0
New Ultraco Revolver Facility
Cash flows from financing activities:
Proceeds from long term debt	55,000,000	0	0
New Ultraco Revolver Facility | Revolving Credit Facility
Cash flows from financing activities:
Repayments of long-term debt	(55,000,000)	0	0
Super Senior Revolver Facility
Cash flows from financing activities:
Proceeds from long term debt	$ 15,000,000	$ 0	$ 0