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Note 6 - Financial Results (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Statement Line Items [Line Items] |  |  |
Interest income (expense) | $ 4,381 | $ (6,151) | $ (11,550)
Financial assets at fair value through profit or loss, category [member] |  |  |
Statement Line Items [Line Items] |  |  |
Interest income (expense) | $ 7,600 | $ 3,600 |

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