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Note 17 - Shareholders' Equity (Details Textual) - EUR (€) € / shares in Units, € in Thousands |  |  |  |  |  |  | 2 Months Ended | 5 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 04, 2019 | Aug. 29, 2018 | Apr. 25, 2017 | Apr. 26, 2016 | Jan. 18, 2013 | Jun. 24, 2010 | Jul. 31, 2001 | Dec. 31, 1998 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2013 | Jun. 28, 2019 | Feb. 18, 2016 | Dec. 19, 2012
Common Stock, Shares, Issued, Total (in shares) |  |  |  |  |  |  |  |  | 29,433,994 | 29,368,394 |  |  |  |  |  |
Common Stock, Par or Stated Value Per Share (in EUR per share) |  |  |  |  |  |  |  |  | € 0.13 | € 0.13 |  |  |  |  |  |
Common Stock, Shares, Outstanding, Ending Balance (in shares) |  |  |  |  |  |  |  |  | 29,141,566 | 28,997,866 |  |  |  |  |  |
Statutory Retained Earnings (Statutory Accumulated Deficit) |  |  |  |  |  |  |  |  | € (15,392) |  |  |  |  |  |  |
Treasury Stock, Shares, Ending Balance (in shares) |  |  |  |  |  |  |  |  | 292,428 | 370,528 |  |  |  |  |  |
Treasury Stock, Shares, Acquired (in shares) |  |  |  |  |  |  | 180,290 | 112,138 |  |  |  |  |  |  |  |
Treasury Stock, Value, Acquired, Par Value Method |  |  |  |  |  |  | € 718 |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) |  |  |  |  |  |  |  |  | 155,000 |  |  |  |  |  |  |
Share Price (in EUR per share) |  |  |  |  |  |  |  |  | € 4.43 |  |  |  |  |  |  |
The 2010 Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Shares Subscribed but Unissued (in shares) |  |  |  |  |  | 229,100 |  |  |  |  |  |  |  |  |  |
The 2012 Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Shares Subscribed but Unissued (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 500,000
The 2016 Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Shares Subscribed but Unissued (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000 |
Share-based Payment Arrangement, Option [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in EUR per share) |  |  |  |  |  |  |  |  | € 3.90 | € 2.65 | € 2.39 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares) |  |  |  |  |  |  |  |  | 1,273,900 | 1,347,600 | 1,207,600 | 1,427,438 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) |  |  |  |  |  |  |  |  | 155,000 | 165,000 | 260,000 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number (in shares) |  |  |  |  |  |  |  |  | 818,900 | 772,600 | 598,850 |  |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount |  |  |  |  |  |  |  |  | € 271 |  |  |  |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  |  |  |  |  |  |  | 3 years 91 days |  |  |  |  |  |  |
Share-based Payment Arrangement, Option [Member] | The 2010 Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) |  |  |  |  |  | 229,100 |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in EUR per share) |  |  |  |  |  | € 2.38 |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year) |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares) |  |  |  |  |  |  |  |  | 42,000 |  |  |  |  |  |  |
Share-based Payment Arrangement, Option [Member] | The 2010 Plan [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  |  |  |  | 1 year |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Option [Member] | The 2010 Plan [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  |  |  |  | 4 years |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Option [Member] | The 2012 Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 500,000
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in EUR per share) |  |  |  |  | € 1.91 |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year) |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares) |  |  |  |  |  |  |  |  | 282,500 |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) |  |  |  |  | 500,000 |  |  |  |  |  |  |  |  |  |  |
Shares Granted, Value, Share-based Payment Arrangement, before Forfeiture |  |  |  |  |  |  |  |  |  |  |  |  | € 660 |  |  |
Share-based Payment Arrangement, Expense |  |  |  |  |  |  |  |  | € 0 | € 0 | € 2 |  |  |  |  |
Share-based Payment Arrangement, Option [Member] | The 2012 Plan [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  |  |  | 1 year |  |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Option [Member] | The 2012 Plan [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  |  |  | 4 years |  |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Option [Member] | The 2016 Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000 |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in EUR per share) | € 3.90 | € 2.65 | € 2.39 | € 3.22 |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year) | 10 years | 10 years | 10 years | 10 years |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares) |  |  |  |  |  |  |  |  | 949,400 |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) | 155,000 | 165,000 | 260,000 | 575,000 |  |  |  |  |  |  |  |  |  |  |  |
Shares Granted, Value, Share-based Payment Arrangement, before Forfeiture | € 299 | € 219 |  |  |  |  |  |  |  |  | 335 | € 960 |  |  |  |
Share-based Payment Arrangement, Expense |  |  |  |  |  |  |  |  | € 260 | € 289 | € 380 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number (in shares) |  |  |  |  |  |  |  |  | 494,400 |  |  |  |  |  |  |
Share-based Payment Arrangement, Option [Member] | The 2016 Plan [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) | 1 year | 1 year | 1 year | 1 year |  |  |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Option [Member] | The 2016 Plan [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) | 4 years | 4 years | 4 years | 4 years |  |  |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Option [Member] | The 2019 Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 358,528 |  |
Options to Subscribe New Shares [Member] | The 2019 Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000 |  |
Treasury Stock, Held for Purchase for Option Holder Exercises [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Stock, Shares, Ending Balance (in shares) |  |  |  |  |  |  |  |  | 42,000 |  |  |  |  |  |  |
Treasury Stock, Reissuance Price Per Share (in EUR per share) |  |  |  |  |  |  |  |  | € 2.38 |  |  |  |  |  |  |
Treasury Stock, Allocated by Board of Directors in Future [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Stock, Shares, Ending Balance (in shares) |  |  |  |  |  |  |  |  | 250,428 |  |  |  |  |  |  |

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