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Note 17 - Discontinued Operations - Results of Discontinued Operations (Details) - Drybulk Fleet [Member] - Discontinued Operations, Disposed of by Means Other than Sale, Spinoff [Member] - USD ($) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Voyage revenue |  | $ 25,934,204 | $ 20,280,215
Commissions (including, $253,503, $324,178 and nil respectively, to related party) |  | (1,411,333) | (1,122,196)
Voyage expenses |  | (410,676) | (2,396,318)
Vessel operating expenses (including, $102,131, $115,026 and nil, respectively, to related party) |  | (9,183,152) | (6,892,388)
Drydocking expenses |  | (1,465,079) | (127,509)
Related party management fees |  | (1,701,340) | (1,409,716)
Vessel depreciation |  | (5,422,155) | (4,786,272)
General and administrative expenses (including $693,524, $731,456 and nil, respectively, to related party) |  | (2,346,502) | (917,160)
Operating income |  | 3,993,967 | 2,628,656
Total other expenses, net |  | (2,874,232) | (1,778,955)
Net income |  | 1,119,735 | 849,701
Dividend Series B Preferred Shares |  | (565,229) |
Net income attributable to common shareholders |  | $ 554,506 | $ 849,701

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- Definition Amount of commissions attributable to disposal group, including, but not limited to, discontinued operation. + References No definition available. + Details
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- Definition Amount of Drydocking expenses attributable to disposal group, including, but not limited to, discontinued operation. + References No definition available. + Details
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- Definition Amount of management fees attributable to disposal group, including, but not limited to, discontinued operation. + References No definition available. + Details
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- Definition Amount of net operating income (loss) attributable to disposal group, including, but not limited to, discontinued operation. + References No definition available. + Details
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- Definition The amount of preferred stock dividends that is an adjustment to net income apportioned to common stockholders attributable to disposal group, including, but not limited to, discontinued operation. + References No definition available. + Details
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- Definition Amount of depreciation and amortization expense attributable to disposal group, including, but not limited to, discontinued operation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5B -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109222650&loc=SL51721673-107760 + Details
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- Definition Amount of general and administrative expense attributable to disposal group, including, but not limited to, discontinued operation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5B -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109222650&loc=SL51721673-107760 + Details
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