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Note 6 - Vessels, Net (Details) - Summary of Vessels, Net - USD ($) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Summary of Vessels, Net [Abstract] |  |  |  |
Balance, December 31 |  | $ 895,387,989 |  | $ 849,452,594
Balance, December 31 | $ (201,940,961) | (201,940,961) | $ (184,035,144) | (172,429,692)
Balance, December 31 |  | 711,352,845 |  | 677,022,902
Acquisitions (transfer from Advances for Vessels under Construction) |  | 200,159,411 | 101,459,533 |
Disposals |  | (1,977,051) | (39,075,007) |
Disposals |  |  | 11,925,771 |
Disposals | (1,977,051) | (1,977,051) | (27,149,236) |
Impairement loss |  | (26,190,677) | (16,449,131) |
Impairement loss |  | 17,951,690 | 10,280,384 |
Impairement loss | (6,775,416) | (8,238,987) | (6,168,747) | $ 0
Vessel held for sale |  | (748,823) |  |
Vessel held for sale |  | (748,823) |  |
Depreciation for the year | (35,857,507) | (35,857,507) | (33,811,607) |
Balance, December 31 | 1,066,630,849 | 1,066,630,849 | 895,387,989 |
Balance, December 31 | $ 864,689,888 | $ 864,689,888 | $ 711,352,845 |

X
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- Definition Represents the impairment of long-lived assets held for use, before considering the effects on accumulated depreciation. + References No definition available. + Details
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- Definition Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land or leased assets). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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