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Revenues - Summary of Analysis of Consolidated Statements of Operations (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disaggregation of Revenue [Line Items] |  |  |
Revenues | $ 144,259,312 | $ 164,330,202 | $ 152,338,278
Time charter revenues - related party |  |  | 1,973,643
Total revenues | 144,259,312 | 164,330,202 | 154,311,921
Time Charter [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 97,249,537 | 104,099,818 | 96,339,915
Bareboat [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 21,764,102 | 24,646,311 | 27,647,268
Voyage Charter [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 24,018,198 | 34,266,082 | 26,924,708
Other Income Revenues [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | $ 1,227,475 | $ 1,317,991 | $ 1,426,387

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- Definition Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 + Details
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