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Note 17 - Shareholders' Equity - Non-vested Options Activity (Details) - € / shares | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Non-vested options outstanding (in shares) | 575,000 |  |
Non-vested options outstanding, weighted average grant-date fair value (in EUR per share) | € 1.47 |  |
Non-vested options granted (in shares) | 155,000 |  |
Non-vested options granted, weighted average grant-date fair value (in EUR per share) | € 1.93 | € 1.33 | € 1.29
Non-vested options vested (in shares) | (204,400) |  |
Non-vested options vested, weighted average grant-date fair value (in EUR per share) | € 1.52 |  |
Non-vested options forfeited (in shares) | (70,600) |  |
Non-vested options forfeited, weighted average grant-date fair value (in EUR per share) | € 1.58 |  |
Non-vested options outstanding (in shares) | 455,000 | 575,000 |
Non-vested options outstanding, weighted average grant-date fair value (in EUR per share) | € 1.58 | € 1.47 |

X
- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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X
- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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X
- Definition Number of non-vested options outstanding. + References No definition available. + Details
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- Definition Number of non-vested options forfeited. + References No definition available. + Details
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- Definition Weighted average grant-date fair value of non-vested options forfeited. + References No definition available. + Details
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- Definition Weighted average grant-date fair value of non-vested options outstanding. + References No definition available. + Details
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- Definition Number of options vested. + References No definition available. + Details
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