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Note 17 - Shareholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2019
Notes Tables |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | Year Ended December 31,
|  | 2019 |  | 2018 |  | 2017
Weighted-average expected life (years) |  |  | 6.25 |  |  |  | 6.25 |  |  |  | 6.25 |
Expected volatility rates (1) |  |  | 49.45 | % |  |  | 52.6 | % |  |  | 57.4 | %
Expected dividend yield |  |  | 0 | % |  |  | 0 | % |  |  | 0 | %
Risk-free interest rate |  |  | -0.08 | % |  |  | 0.18 | % |  |  | 0.02 | %
Weighted-average exercise price (€) |  |  | 3.90 |  |  |  | 2.65 |  |  |  | 2.39 |
Weighted-average fair value of options granted during the year (€) |  |  | 1.93 |  |  |  | 1.33 |  |  |  | 1.29 |
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block] |
|  | 2019 |  | 2018 |  | 2017
|  | Options |  | Weighted average exercise price (€) |  | Options |  | Weighted average exercise price (€) |  | Options |  | Weighted average exercise price (€)
Outstanding on January 1, |  |  | 1,347,600 |  |  |  | 2.61 |  |  |  | 1,207,600 |  |  |  | 2.61 |  |  |  | 1,427,438 |  |  |  | 2.94 |
Granted |  |  | 155,000 |  |  |  | 3.90 |  |  |  | 165,000 |  |  |  | 2.65 |  |  |  | 260,000 |  |  |  | 2.39 |
Exercised |  |  | (143,700 | ) |  |  | 2.16 |  |  |  | - |  |  |  | - |  |  |  | (60,000 | ) |  |  | 1.91 |
Forfeited |  |  | (85,000 | ) |  |  | 1.94 |  |  |  | (25,000 | ) |  |  | 3.05 |  |  |  | (134,750 | ) |  |  | 3.09 |
Expired |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | (285,088 | ) |  |  | 3.99 |
Outstanding on December 31, |  |  | 1,273,900 |  |  |  | 2.78 |  |  |  | 1,347,600 |  |  |  | 2.61 |  |  |  | 1,207,600 |  |  |  | 2.61 |
Exercisable on December 31, |  |  | 818,900 |  |  |  | 2.60 |  |  |  | 772,600 |  |  |  | 2.44 |  |  |  | 598,850 |  |  |  | 2.29 |
Share purchase options available for grant on December 31 |  |  | 250,428 |  |  |  |  |  |  |  | 250,428 |  |  |  |  |  |  |  | 250,428 |  |  |  |  |
Share-based Payment Arrangement, Option, Exercise Price Range [Table Text Block] |
|  | Outstanding options |  | Fully vested options (1)
Exercise price (€) |  | Options |  | Weighted average remaining contractual life |  | Weighted average exercise price (€) |  | Aggregate Intrinsic Value (2) (€) |  | Options |  | Weighted average exercise price (€) |  | Aggregate Intrinsic Value (2)
3.90 |  |  | 130,000 |  |  |  | 9.3 |  |  |  | 3.90 |  |  |  | 5,954 |  |  |  | - |  |  |  | - |  |  |  | - |
3.22 |  |  | 485,000 |  |  |  | 6.3 |  |  |  | 3.22 |  |  |  | 352,013 |  |  |  | 363,750 |  |  |  | 3.22 |  |  |  | 264,010 |
2.65 |  |  | 145,000 |  |  |  | 8.7 |  |  |  | 2.65 |  |  |  | 187,891 |  |  |  | 36,250 |  |  |  | 2.65 |  |  |  | 46,973 |
2.39 |  |  | 189,400 |  |  |  | 7.3 |  |  |  | 2.39 |  |  |  | 294,669 |  |  |  | 94,400 |  |  |  | 2.39 |  |  |  | 146,868 |
2.38 |  |  | 42,000 |  |  |  | 0.5 |  |  |  | 2.38 |  |  |  | 65,764 |  |  |  | 42,000 |  |  |  | 2.38 |  |  |  | 65,764 |
1.91 |  |  | 282,500 |  |  |  | 3.0 |  |  |  | 1.91 |  |  |  | 575,114 |  |  |  | 282,500 |  |  |  | 1.91 |  |  |  | 575,114 |
1.91 to 3.90 |  |  | 1,273,900 |  |  |  | 7.0 |  |  |  | 2.78 |  |  |  | 1,481,405 |  |  |  | 818,900 |  |  |  | 2.60 |  |  |  | 1,098,728 |
Schedule of Nonvested Share Activity [Table Text Block] |
|  | Options |  | Weighted average Grant-Date Fair Value (€)
Non-vested at January 1, 2019 |  |  | 575,000 |  |  |  | 1.47 |
Granted |  |  | 155,000 |  |  |  | 1.93 |
Vested |  |  | (204,400 | ) |  |  | 1.52 |
Forfeited |  |  | (70,600 | ) |  |  | 1.58 |
Non-vested at December 31, 2019 |  |  | 455,000 |  |  |  | 1.58 |
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] |
|  | Year Ended December 31, 2019
|  | Foreign currency translation adjustments |  | Provision for retirement indemnities |  | Total
Beginning balance |  |  | (3,173 | ) |  |  | (577 | ) |  |  | (3,748 | )
Other comprehensive income (loss) before reclassifications |  |  | - |  |  |  | - |  |  |  | - |
Reclassified from accumulated other comprehensive loss |  |  | - |  |  |  | - |  |  |  | - |
Net current-period other comprehensive income (loss) |  |  | (61 | ) |  |  | 374 |  |  |  | 313 |
Ending balance |  |  | (3,234 | ) |  |  | (203 | ) |  |  | (3,436 | )
|  | Year Ended December 31, 2018
|  | Foreign currency translation adjustments |  | Provision for retirement indemnities |  | Total
Beginning balance |  |  | (3,027 | ) |  |  | (577 | ) |  |  | (3,604 | )
Other comprehensive income (loss) before reclassifications |  |  | - |  |  |  | - |  |  |  | - |
Reclassified from accumulated other comprehensive loss |  |  | - |  |  |  | - |  |  |  | - |
Net current-period other comprehensive income (loss) |  |  | (146 | ) |  |  | - |  |  |  | (146 | )
Ending balance |  |  | (3,173 | ) |  |  | (577 | ) |  |  | (3,748 | )

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