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Consolidated Statements of Cash Flows - USD ($)
 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Operating activities    
Net (loss) income $ (4,179,484) $ 2,238,169
Adjustments to reconcile net (loss) income to net cash provided by operations:    
Depreciation and amortization expense 7,653,507 7,044,052
Amortization of deferred financing costs 368,387 354,431
Amortization of prepaid rent 60,969  
Unrealized loss (gain) on derivative instruments (490,007) (1,051,432)
(Gain) loss from equity method investee (194,612) 30,380
Provision for doubtful accounts (10,356) 931,962
Loss on sale and leaseback of vessel 9,134,908  
Share-based compensation 677,936 176,068
Change in operating assets and liabilities:    
Decrease in restricted cash 0 500,000
Accounts receivable (6,166,383) 4,205,465
Bunker inventory (1,741,848) (900,310)
Advance hire, prepaid expenses and other current assets (3,343,536) (1,082,336)
Drydocking costs (754,120) (42,478)
Accounts payable, accrued expenses and other current liabilities 6,853,566 (2,319,659)
Deferred revenue 482,485 (99,238)
Net cash provided by operating activities 8,351,412 9,985,074
Investing activities    
Purchase of vessels (46,846,313) (402,432)
Purchase of building and equipment (16,775) (30,000)
Purchase of non-controlling interest in consolidated subsidiary (832,572) 0
Net cash used in investing activities (47,695,660) (432,432)
Financing activities    
Payments of related party debt 0 (2,500,946)
Proceeds from long-term debt 25,000,000 1,096,000
Payments of financing and issuance costs (876,542) (34,425)
Payments of long-term debt (15,723,929) (13,110,553)
Sale Leaseback Transaction, Net Proceeds, Financing Activities 28,000,000 0
Repayments of Long-term Capital Lease Obligations (344,733) 0
Proceeds from (Repayments of) Restricted Cash, Financing Activities 2,100,000 0
Decrease in restricted cash 0 (100,000)
Proceeds from Issuance of Common Stock 8,302,985 0
Net cash provided by (used in) financing activities 46,457,781 (14,649,924)
Net increase (decrease) in cash and cash equivalents 7,113,533 (5,097,282)
Cash and cash equivalents at beginning of period 22,322,949 37,520,240
Cash and cash equivalents at end of period 29,436,482 32,422,958
Disclosure of noncash items    
Cash paid for interest 3,022,756 $ 2,381,513
Extinguishment of Related Party Debt $ 9,278,800