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Note 16 - Subsequent Events (Details Textual) - USD ($) $ in Thousands | Sep. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2017
--- | --- | --- | --- | ---
Assets, Total |  | $ 627,319 | $ 625,581 | $ 619,827
Scenario, Forecast [Member] |  |  |  |
Assets, Total | $ 800,000 |  |  |

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