Condensed Consolidated Balance Sheets - USD ($)	Jun. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 79,278,151	$ 69,927,594
Restricted cash - current	4,446,177	18,846,177
Accounts receivable, net of a reserve of $2,134,000 and $2,357,191, respectively	23,995,321	13,843,480
Prepaid expenses	4,294,715	3,182,815
Inventories	15,899,222	11,624,833
Vessel held for sale	4,885,998	0
Collateral on derivatives	33,499,170	0
Other current assets	1,478,163	839,881
Total current assets	167,776,917	118,264,780
Noncurrent assets:
Vessel and vessel improvements, at cost, net of accumulated depreciation	876,088,651	810,713,959
Advances for vessel purchases	5,340,000	3,250,000
Operating lease right-of-use assets	12,441,041	7,540,871
Other fixed assets, net of accumulated depreciation	363,993	489,179
Restricted cash - noncurrent	75,000	75,000
Deferred drydock costs, net	26,504,065	24,153,776
Deferred financing costs	99,033	0
Fair value of derivatives asset - noncurrent	36,384	0
Advances for ballast water systems and other assets	4,443,281	2,639,491
Total noncurrent assets	925,391,448	848,862,276
Total assets	1,093,168,365	967,127,056
Current liabilities:
Accounts payable	18,921,097	10,589,970
Accrued interest	4,558,933	4,690,135
Other accrued liabilities	10,601,676	11,747,064
Fair value of derivatives - current	31,607,854	481,791
Current portion of operating lease liabilities	10,639,630	7,615,371
Unearned charter hire revenue	8,402,876	8,072,295
Holdco Revolving Credit Facility, net of debt issuance costs	23,724,982	0
Current portion of long-term debt	41,444,297	39,244,297
Total current liabilities	149,901,345	82,440,923
Noncurrent liabilities:
Total debt	414,823,609	412,931,021
Fair value of derivatives - noncurrent	85,603	650,607
Noncurrent portion of operating lease liabilities	2,099,452	686,422
Total noncurrent liabilities	417,008,664	414,268,050
Total liabilities	566,910,009	496,708,973
Commitments and contingencies
Stockholders' equity:
Preferred stock	0	0
Common stock	127,533	116,618
Additional paid-in capital	979,682,504	943,571,685
Accumulated deficit	(453,063,487)	(472,137,822)
Accumulated other comprehensive loss	(488,194)	(1,132,398)
Total stockholders' equity	526,258,356	470,418,083
Total liabilities and stockholders' equity	1,093,168,365	967,127,056
Norwegian Bond Debt Facility
Noncurrent liabilities:
Total debt	165,993,915	169,290,230
New First Lien Facility
Noncurrent liabilities:
Total debt	0	14,896,357
New Ultraco Debt Facility
Noncurrent liabilities:
Total debt	125,093,090	132,083,949
New Ultraco Debt Facility Revolver Loan
Noncurrent liabilities:
Total debt	25,000,000	0
Convertible Bond Debt
Noncurrent liabilities:
Total debt	$ 98,736,604	$ 96,660,485