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Note 10 - Shareholders' Equity (Details Textual)			1 Months Ended	12 Months Ended
	Jan. 06, 2025	Nov. 21, 2021 shares	Dec. 31, 2020 € / shares shares	Dec. 31, 2024 € / shares shares	Dec. 31, 2023 € / shares shares	Dec. 31, 2022 shares	Dec. 22, 2024 € / shares
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in EUR per share) | € / shares
Restricted Stock Units (RSUs) [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Granted (in shares)		63,868
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)				0	19,724	15,967
CSOP [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Net of Forfeitures (in shares)			1,850,100
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in EUR per share) | € / shares			€ 0.06
CSOP [Member] | Share-Based Payment Arrangement, Option [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)			1 year
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year)			4 years
Subsequent Event [Member] | Reverse Stock Split [Member]
Stockholders' Equity Note, Stock Split, Conversion Ratio	75
Ordinary Shares [Member]
Common Stock, Shares Authorized (in shares)				4,300,000	4,300,000
Common Stock, Par or Stated Value Per Share (in EUR per share) | € / shares				€ 0.02	€ 0.06		€ 0.06
Common Stock, Shares, Issued (in shares)				1,409,885	1,408,895
Ordinary Shares [Member] | Subsequent Event [Member] | Reverse Stock Split [Member]
Stockholders' Equity Note, Stock Split, Conversion Ratio	75
High Voting Shares [Member]
Common Stock, Shares Authorized (in shares)				53,400	53,400
Common Stock, Par or Stated Value Per Share (in EUR per share) | € / shares				€ 0.5	€ 1.5		€ 1.5
Common Stock, Shares, Issued (in shares)				40,000	40,000
High Voting Shares [Member] | Subsequent Event [Member] | Reverse Stock Split [Member]
Stockholders' Equity Note, Stock Split, Conversion Ratio	75

X

- Definition

Face amount or stated value per share of common stock.

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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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Net number of non-option equity instruments granted to participants.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Ratio applied to the conversion of stock split, for example but not limited to, one share converted to two or two shares converted to one.

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