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Note 18 - Total Sales (Tables) | 12 Months Ended
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Dec. 31, 2019
Notes Tables |
Revenue from External Customers by Geographic Areas [Table Text Block] |
Primary geographical markets (€) |  | 2019 |  | 2018 |  | 2017
Asia |  |  | 17,939 |  |  |  | 14,119 |  |  |  | 13,461 |
France |  |  | 11,350 |  |  |  | 11,577 |  |  |  | 10,573 |
United States |  |  | 5,194 |  |  |  | 2,048 |  |  |  | 1,748 |
Others geographical areas |  |  | 10,377 |  |  |  | 11,419 |  |  |  | 9,904 |
|  |  | 44,859 |  |  |  | 39,163 |  |  |  | 35,686 |
Disaggregation of Revenue [Table Text Block] |
Timing of revenue recognition |  | 2019 |  | 2018 |  | 2017
Products transferred at a point in time |  |  | 36,767 |  |  |  | 31,373 |  |  |  | 28,760 |
Products and services transferred over time |  |  | 8,092 |  |  |  | 7,790 |  |  |  | 6,927 |
|  |  | 44,859 |  |  |  | 39,163 |  |  |  | 35,686 |

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