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Consolidated Statements of Cash Flows - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Operating activities    
Net income $ 23,981,646 $ 9,100,655
Adjustments to reconcile net income to net cash provided by operations:    
Depreciation and amortization expense 17,620,725 15,614,571
Amortization of deferred financing costs 693,788 681,279
Amortization of prepaid rent 121,937 121,938
Unrealized loss (gain) on derivative instruments 3,868,948 (360,316)
Income from equity method investee (224,001) (256,478)
Provision for doubtful accounts 268,990 543,621
Loss on sale and leaseback of vessels 860,426 9,275,042
Drydocking costs (2,135,670) (3,775,393)
Recognized cost for restricted stock issued as compensation (1,200,214) (1,074,038)
Change in operating assets and liabilities:    
Accounts receivable (7,661,352) (5,642,755)
Bunker inventory (3,865,375) (2,153,775)
Advance hire, prepaid expenses and other current assets 1,624,441 (1,368,584)
Accounts payable, accrued expenses and other current liabilities (392,160) 6,976,446
Deferred revenue 4,172,392 (607,058)
Net cash provided by operating activities 40,134,949 29,223,231
Investing activities    
Purchase of vessels and vessel improvements (17,126,213) (64,029,798)
Purchase of building and equipment (414,922) 0
Proceeds from sale of equipment 31,594 306,968
Purchase of non-controlling interest in consolidated subsidiary 0 (830,906)
Net cash used in investing activities (17,509,541) (64,553,736)
Financing activities    
Payments on related party debt (4,131,851) 0
Proceeds from long-term debt 0 35,000,000
Payments of financing and issuance costs (728,041) (1,022,549)
Payments of long-term debt (21,058,742) (25,329,458)
Proceeds from sale and leaseback of vessels 27,750,000 28,000,000
Payments on capital lease obligation (3,501,589) (1,198,721)
Dividends paid to non-controlling interests (904,803) 0
Common stock accrued dividends paid (2,270,000) (1,001,424)
Contributions from noncontrolling interests (146,647) 0
Contributions from noncontrolling interests 0 1,359,990
Proceeds from private placement of common stock, net of issuance costs (50,812) 9,631,530
Net cash (used in) provided by financing activities (5,042,485) 45,439,368
Net increase in cash, cash equivalents and restricted cash 17,582,923 10,108,863
Cash, cash equivalents and restricted cash at beginning of period 38,531,812 28,422,949
Cash, cash equivalents and restricted cash at end of period 53,614,735 34,531,812
Disclosure of noncash items    
Conversion of related party debt to noncontrolling interest 0 9,278,800
Conversion of dividend into common stock 0 4,285,000
Cash paid for interest $ 8,636,458 $ 6,978,754