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Note 16 - Revenues (Tables) | 12 Months Ended
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Dec. 31, 2017
Notes Tables |
Disaggregation of Revenue [Table Text Block] |
|  | Year ended December 31,
|  | 2015 |  | 2016 |  | 2017
Time charter revenues |  |  | 68,834,267 |  |  |  | 83,211,819 |  |  |  | 97,195,215 |
Time charter revenues – related party |  |  | 9,814,000 |  |  |  | 7,592,784 |  |  |  | 1,973,643 |
Bareboat revenues |  |  | 32,977,819 |  |  |  | 29,422,512 |  |  |  | 27,647,268 |
Voyage charter revenues |  |  | 26,421,003 |  |  |  | 23,210,618 |  |  |  | 26,924,708 |
Ballast bonus |  |  | 300,000 |  |  |  | 50,000 |  |  |  | 160,000 |
Other income |  |  | 3,214,382 |  |  |  | 2,284,418 |  |  |  | 1,426,387 |
Off-hire |  |  | (245,590 | ) |  |  | (1,639,968 | ) |  |  | (1,015,300 | )
Total |  |  | 141,315,881 |  |  |  | 144,132,183 |  |  |  | 154,311,921 |

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