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Note 21 - Research and Development Expenses - Research and Development Expenses (Details) - EUR (€) € in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Gross research and development expenses | € (4,727) | € (4,863) | € (4,539)
Research Tax Credit | 762 | 685 | 504
Grants | 236 | 90 | 154
Net Research and development expenses | € (3,728) | € (4,088) | € (3,881)

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- Definition The amount of grants received, including European, national and regional grants for the development of innovative imaging solutions for the focal treatment of liver cancer (HECAM Development project). + References No definition available. + Details
Name: | edap_GrantsCredit
Namespace Prefix: | edap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The gross amount of research and development expenses. + References No definition available. + Details
Name: | edap_GrossResearchAndDevelopmentExpenses
Namespace Prefix: | edap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The tax credit relate to research. + References No definition available. + Details
Name: | edap_ResearchTaxCredit
Namespace Prefix: | edap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 730 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420194&loc=d3e21568-108373 + Details
Name: | us-gaap_ResearchAndDevelopmentExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration