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Note 1 - Basis of Presentation and General Information (Tables) | 12 Months Ended
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Dec. 31, 2019
Notes Tables |
Schedules of Concentration of Risk, by Risk Factor [Table Text Block] |
|  | Year ended December 31,
Charterer |  | 2017 |  | 2018 |  | 2019
CMA CGM, Marseille |  |  | 34 | % |  |  | 51 | % |  |  | 24 | %
New Golden Sea Shipping Pte. Ltd., Singapore |  |  | 31 | % |  |  | 33 | % |  |  | 21 | %
Hapag-Lloyd AG, Hamburg |  |  | - |  |  |  | - |  |  |  | 16 | %
MSC Geneva |  |  | 17 | % |  |  | 11 | % |  |  | 15 | %
Maersk Line A/S |  |  | - |  |  |  | - |  |  |  | 11 | %

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