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Note 13 - Investments in Unconsolidated Joint Ventures - Summary of Financial Information (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Current assets | $ 7,263 |  | $ 5,288
Current liabilities | 47,337 |  | 36,819
Long-term liabilities | 249,613 |  | 117,388
City of Athens [Member] |  |  |
Current assets | 1,691 |  | 898
Non-current assets | 30,291 |  | 30,853
Current liabilities | 2,262 |  | 1,530
Long-term liabilities | 15,060 |  | 15,627
Net operating revenues | 2,638 | $ 1,501 |
Net (loss)/gain | 484 | 138 |
Eco Nine [Member] |  |  |
Current assets | 1,494 |  | 684
Non-current assets | 30,412 |  | 30,975
Current liabilities | 2,629 |  | 1,762
Long-term liabilities | 15,335 |  | $ 15,900
Net operating revenues | 2,637 | 519 |
Net (loss)/gain | $ 365 | $ (129) |

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