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Consolidated Statements of Cash Flows - USD ($)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Operating activities    
Net income $ 28,537,772 $ 85,507,704
Adjustments to reconcile net income to net cash provided by operations:    
Depreciation and amortization expense 30,070,395 29,489,810
Amortization of deferred financing costs 946,593 1,005,487
Amortization of prepaid rent 121,532 122,343
Unrealized loss (gain) on derivative instruments 2,925,347 (682,323)
Income from equity method investee (684,470) (807,142)
Earnings attributable to non-controlling interest recorded as interest expense 462,150 6,717,414
Provision for doubtful accounts 2,938,879 2,377,389
Loss on impairment of vessels 0 3,007,809
Loss on sales of vessels 1,738,511 318,032
Drydocking costs (4,154,283) (6,019,126)
Share-based compensation 2,087,807 1,767,726
Change in operating assets and liabilities:    
Accounts receivable (14,075,231) 15,126,727
Bunker inventory 12,548,170 (1,956,676)
Advance hire, prepaid expenses and other current assets (342,776) 19,086,893
Accounts payable, accrued expenses and other current liabilities (4,079,047) (8,939,313)
Deferred revenue (5,254,072) (11,321,354)
Net cash provided by operating activities 53,787,277 134,801,400
Investing activities    
Purchase of vessels and vessel improvements (27,264,044) (35,740,482)
Proceeds from sale of vessels 17,271,489 8,400,000
Payments to Acquire Businesses, Net of Cash Acquired (7,200,000) 0
Purchase of equipment and internal use software 0 (653,452)
Contribution Payments To Acquire Non-Controlling Interest (427,270) (515,162)
Proceeds from Equity Method Investment, Distribution, Return of Capital 1,637,500 0
Net cash used in investing activities (15,982,325) (28,509,096)
Financing activities    
Proceeds from long-term debt 0 8,500,000
Payments of financing and issuance costs 0 (466,544)
Payments of long-term debt (15,782,528) (15,443,115)
Proceeds from finance leases 0 15,000,000
Payments on finance lease obligation (20,238,131) (15,834,059)
Repayments of Other Long-term Debt 0 (5,000,000)
Dividends paid to non-controlling interests (10,400,000) (5,000,000)
Common stock accrued dividends paid (18,103,750) (13,414,984)
Cash paid for incentive compensation shares relinquished (127,283) (407,898)
Payments to non-controlling interest recorded as long-term liability (2,500,000) (2,050,000)
Net cash used in financing activities (67,151,692) (34,116,600)
Net (decrease) increase in cash and cash equivalents (29,346,740) 72,175,704
Cash and cash equivalents at beginning of period 128,384,606 56,208,902
Cash and cash equivalents at end of period 99,037,866 128,384,606
Disclosure of noncash items    
Cash paid for interest $ 18,850,078 $ 14,906,972