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Note 11 - Other Income (Expense), Net (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Other Nonoperating Income (Expense), Total | $ 1,804 | $ (38) | $ (9)
Disgorgement of Short-Swing Profits from the Sale of Common Stock [Member] |  |  |
Other Nonoperating Income (Expense), Total | $ 1,900 |  |

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- Definition Amount of income (expense) related to nonoperating activities, classified as other. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.9) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 + Details
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Period Type: | duration

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- Details
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Data Type: | na
Balance Type: |
Period Type: |