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Note 16 - Other Long-term Liabilities - Reconciliation of Pension Cost Components (Details) - EUR (€) € in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Defined Benefit Retirement Indemnity Plans, France [Member] |  |  |  |  |  |
Benefit obligations at beginning of year |  | € 976 | [1] | € 895 | [1] | € 842
Service cost |  | 68 |  | 67 |  | 66
Interest cost |  | 16 |  | 14 |  | 13
Net loss or (gain) |  | 2 |  |  |  |
Actuarial (gain) or loss |  | (93) |  |  |  |
Amortization of net prior service cost |  | 1 |  | 1 |  | 1
Benefits paid |  |  |  |  |  | (27)
Benefit obligations at end of year | [1] | 969 |  | 976 |  | 895
Unrecognized actuarial (gain) loss | [2] | 48 |  | 141 |  | 144
Unrecognized prior service cost | [2] | 18 |  | 20 |  | 22
Accrued pension cost |  | 903 |  | 815 |  | 729
Defined Benefit Retirement Indemnity Plans, Japan [Member] |  |  |  |  |  |
Benefit obligations at beginning of year |  | 1,311 | [3] | 1,182 | [3] | 1,162
Service cost |  | 140 |  | 131 |  | 118
Interest cost |  | 6 |  | 6 |  | 6
Actuarial (gain) or loss |  | (294) |  |  |  | (12)
Benefits paid |  | (3) |  | (94) |  | (17)
Benefit obligations at end of year | [3] | 1,230 |  | 1,311 |  | 1,182
Unrecognized actuarial (gain) loss | [4] | 136 |  | 416 |  | 412
Unrecognized prior service cost | [4] |  |  |  |  |
Accrued pension cost |  | 1,093 |  | 895 |  | 770
Amortization of net loss |  | 27 |  | 26 |  | 24
Exchange rate impact |  | € 42 |  | € (60) |  | € (99)
[1] | The accumulated benefit obligation was EUR693 thousand and EUR692 thousand at December 31, 2019 and 2018 respectively.
[2] | The amount in accumulated other comprehensive income (loss) to be recognized as components of net periodic benefit costs in 2020 is EUR1 thousand.
[3] | The accumulated benefit obligation was EUR1,062 thousand and EUR960 thousand at December 31, 2019 and 2018, respectively.
[4] | The amount in accumulated other comprehensive income (loss) to be recognized as components of net periodic benefit costs in 2020 is &#8364;1 thousand.

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- Definition Amount, after tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669686-108580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Amount, after tax, of accumulated other comprehensive (income) loss for cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669686-108580 + Details
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