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Note 10 - Shareholders' Equity (Details Textual) |  |  | 1 Months Ended | 12 Months Ended |
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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 |  |  |  |  |  |

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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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