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Note 6 - Vessels, Net - Summary of Vessels, Net (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Vessel Cost, Balance | $ 1,066,630,849 | $ 895,387,989 |
Accumulated Amortization, Balance | (201,940,961) | (184,035,144) |
Net Book Value, Balance | 864,689,888 | 711,352,845 |
Vessel Cost, Acquisitions | 44,432,663 | 200,159,411 |
Vessel Cost, Disposals | (591,137) | (1,977,051) |
Accumulated Amortization, Disposals |  |  |
Net Book Value, Disposals | (591,137) | (1,977,051) |
Vessel Cost, Impairment loss | (34,859,054) | (26,190,677) |
Accumulated Amortization, Impairment loss | 29,123,968 | 17,951,690 |
Net Book Value, Impairment loss | (5,735,086) | (8,238,987) | $ (6,168,747)
Vessel Cost, Vessel Held For Sale |  | (748,823) |
Accumulated Amortization, Depreciation | (39,096,589) | (35,857,507) | (33,811,607)
Net Book Value, Depreciation | (39,096,589) | (35,857,507) |
Vessel Cost, Balance | 1,075,613,321 | 1,066,630,849 | 895,387,989
Accumulated Amortization, Balance | (211,913,582) | (201,940,961) | (184,035,144)
Net Book Value, Balance | $ 863,699,739 | $ 864,689,888 | $ 711,352,845

X
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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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