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Note 17 - Shareholders' Equity - Stock Option Assumptions (Details) - € / shares		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Weighted-average expected life (years) (Year)		6 years 91 days	6 years 91 days	6 years 91 days
Expected volatility rates(1)	[1]	49.45%	52.60%	57.40%
Expected dividend yield		0.00%	0.00%	0.00%
Risk-free interest rate		0.08%	0.18%	0.02%
Weighted-average exercise price (€) (in EUR per share)		€ 3.90	€ 2.65	€ 2.39
Non-vested options granted, weighted average grant-date fair value (in EUR per share)		€ 1.93	€ 1.33	€ 1.29
[1] Historical volatility calculated over 10 years.

X

- Definition

Agreed-upon price for the exchange of the underlying asset relating to the share-based payment award.

+ References

No definition available.

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- Definition

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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-Section 50
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- Definition

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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