Condensed Consolidated Statements of Cash Flows - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Cash flows from operating activities:
Net income	$ 29,483	$ 52,745
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	8,168,411	8,073,353
Amortization of operating lease right-of-use asset	3,271,111
Amortization of deferred drydocking costs	1,238,698	1,203,062
Amortization of debt discount and debt issuance costs	503,716	490,095
Amortization of fair value below contract value of time charter acquired	0	(170,475)
Loss on debt extinguishment	2,268,452	0
Gain on sale of vessels, net	(4,106,547)	0
Net unrealized (gain)/loss on fair value of derivatives	(2,958,154)	208,235
Stock-based compensation expense	1,445,469	3,510,911
Drydocking expenditures	(2,527,553)	(1,107,414)
Changes in operating assets and liabilities:
Accounts payable	1,467,508	1,544,461
Accounts receivable	810,103	3,270,432
Accrued interest	5,255,356	4,122,188
Inventories	2,999,999	490,738
Operating lease liabilities short and long-term	(3,643,179)
Other current and non-current assets	1,084,257	(121,954)
Other accrued liabilities and non current Other liabilities	(2,306,786)	(5,009,784)
Prepaid expenses	694,789	(652,271)
Unearned revenue	(1,753,257)	(1,031,082)
Net cash provided by operating activities	11,941,876	14,873,240
Cash flows from investing activities:
Advance paid for purchase of scrubbers and ballast water systems	(11,244,778)	0
Proceeds from redemption of short-term investment	0	4,500,000
Proceeds from sale of vessels	12,820,557	0
Purchase of other fixed assets	(23,924)	966
Purchase of vessels and vessel improvements	(18,465,609)	(19,841,535)
Net cash used in investing activities	(16,913,754)	(15,340,569)
Cash flows from financing activities:
Repayment of lines of credit	(60,000,000)	0
Debt issuance costs paid to lenders on New Ultraco Debt Facility	(3,156,250)	0
Cash used to settle net share equity awards	(877,161)	(254,146)
Other financing costs	0	(1,231,935)
Net cash provided by financing activities	6,806,589	2,113,919
Net increase in cash, cash equivalents and restricted cash	1,834,711	1,646,590
Cash, cash equivalents and restricted cash at beginning of period	78,163,638	56,325,961	$ 56,325,961
Cash, cash equivalents and restricted cash at end of period	79,998,349	57,972,551	$ 78,163,638
SUPPLEMENTAL CASH FLOW INFORMATION
Cash paid during the period for interest	901,516	1,648,787
Accrual for other financing costs included in Other accrued liabilities	300,000	0
Accruals for Scrubbers and ballast water treatment systems included in Accounts payable and Other accrued liabilities	4,749,057	0
New First Lien Facility
Cash flows from financing activities:
Repayment of lines of credit	(5,000,000)	(5,000,000)
Proceeds from debt facility	5,000,000	0
Ultraco Debt Facility
Cash flows from financing activities:
Proceeds from debt facility	0	8,600,000
Repayments of long-term debt	(82,600,000)	0
New Ultraco Debt Facility
Cash flows from financing activities:
Proceeds from debt facility	$ 153,440,000	$ 0