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SHAREHOLDERS' EQUITY (Details)
1 Months Ended 2 Months Ended 5 Months Ended 12 Months Ended
Dec. 31, 2022
EUR (€)
€ / shares
shares
Dec. 15, 2022
EUR (€)
€ / shares
shares
Nov. 08, 2022
EUR (€)
€ / shares
shares
Sep. 28, 2022
shares
Jun. 30, 2022
shares
May 17, 2022
EUR (€)
€ / shares
shares
Mar. 30, 2022
EUR (€)
shares
Nov. 17, 2021
EUR (€)
€ / shares
shares
Sep. 28, 2021
EUR (€)
shares
Jun. 11, 2021
EUR (€)
€ / shares
shares
Apr. 04, 2019
€ / shares
shares
Aug. 29, 2018
€ / shares
shares
Apr. 25, 2017
€ / shares
shares
Apr. 26, 2016
€ / shares
shares
Jan. 18, 2013
€ / shares
shares
Sep. 30, 2022
EUR (€)
shares
Apr. 30, 2021
EUR (€)
shares
Jul. 31, 2001
EUR (€)
shares
Dec. 31, 1998
shares
Dec. 31, 2022
EUR (€)
€ / shares
shares
Dec. 31, 2021
EUR (€)
€ / shares
shares
Dec. 31, 2020
EUR (€)
shares
Dec. 31, 2019
EUR (€)
shares
Dec. 31, 2018
EUR (€)
Dec. 31, 2017
EUR (€)
Dec. 31, 2016
EUR (€)
Dec. 31, 2013
EUR (€)
Dec. 31, 2022
$ / shares
Sep. 30, 2022
$ / shares
Jun. 30, 2021
shares
Apr. 30, 2021
$ / shares
Jun. 28, 2019
shares
Feb. 18, 2016
shares
Dec. 19, 2012
shares
Common stock, shares issued 37,197,731                                     37,197,731 33,758,564                          
Common stock, par value | € / shares € 0.13                                     € 0.13 € 0.13                          
Commons stock, shares outstanding 36,910,925                                     36,910,925 33,466,136                          
Issuance costs | €                                       € 1,954,000 € 1,961,000                          
Statutory Retained Earnings (Statutory Accumulated Deficit) | € € 14,329,000                                     € 14,329,000                            
Treasury stock 286,806                                     286,806 292,428                          
Treasury Stock, Shares, Acquired (in shares)                                   180,290 106,516                              
Treasury Stock, Value, Acquired, Par Value Method | €                                   € 697,000                                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)                                       571,000 1,392,428                          
Share Price | $ / shares                                                       $ 10.66            
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  
The 2021 Plan [Member] | Maximum                                                                    
Common Stock, Shares Subscribed but Unissued (in shares)                                                           2,000,000        
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) | € / shares                                       € 9.07 € 5.56                          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares) 2,613,886                                     2,613,886 2,408,508 1,186,900 1,273,900                      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)                                       571,000 1,392,428                          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number (in shares) 1,362,205                                     1,362,205 1,149,401 970,650                        
Stock issued during period shares stock options exercised                                       320,622 150,820 23,750                        
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount | € € 2,612,000                                     € 2,612,000                            
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)                                       2 years 10 months 24 days                            
Share-based Payment Arrangement, Option [Member] | The 2012 Plan [Member]                                                                    
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in EUR per share) | € / shares                             € 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) 0                                     0                            
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 | €                                                     € 660,000              
Recognition period of non-cash financial charges                             48 months                                      
Share-based Payment Arrangement, Option [Member] | The 2012 Plan [Member] | Minimum                                                                    
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                                                                    
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) | € / shares                     € 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) 696,080                                     696,080                            
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 | €                                             € 299,000 € 219,000 € 335,000 € 960,000                
Recognition period of non-cash financial charges                                                   48 months                
Share-based Payment Arrangement, Expense | €                                       € 25,000 € 65,000 € 160,000                        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number (in shares) 668,580                                     668,580                            
Share-based Payment Arrangement, Option [Member] | The 2016 Plan [Member] | Minimum                                                                    
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                                                                    
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    
Share-based Compensation Arrangement by Share-based Payment Award, Number of pre-existing shares available for future puchase option                   292,428                                                
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in EUR per share) | € / shares                   € 5.59                                                
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) 1,266,806                                     1,266,806                            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)                   1,000,000                                                
Shares Granted, Value, Share-based Payment Arrangement, before Forfeiture | €                   € 681,000                                                
Recognition period of non-cash financial charges                                             36 months                      
Share-based Payment Arrangement, Expense | €                                       € 1,104,000 1,484,000                          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number (in shares) 633,403                                     633,403                            
Share-based Payment Arrangement, Option [Member] | The 2019 Plan [Member] | Minimum                                                                    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)                   6 months                                                
Share-based Payment Arrangement, Option [Member] | The 2019 Plan [Member] | Maximum                                                                    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)                   3 years                                                
Share-based Payment Arrangement, Option [Member] | The 2021 Plan [Member]                                                                    
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in EUR per share) | € / shares   € 9.94 € 10.32     € 6.41   € 5.18                                                    
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) 44,000                                     44,000                            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)   395,000 32,000     144,000   100,000 61,500                                                  
Shares Granted, Value, Share-based Payment Arrangement, before Forfeiture | €   € 1,858,000 € 161,000     € 450,000 € 259,000 € 229,000 € 340,000                                                  
Recognition period of non-cash financial charges 36 months                                     36 months                            
Share-based Payment Arrangement, Expense | €                                       € 442,000 25,000                          
Share-based Payment Arrangement, Option [Member] | The 2021 Plan [Member] | Minimum                                                                    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)   6 months 6 months     6 months 1 year 6 months 1 year                                                  
Share-based Payment Arrangement, Option [Member] | The 2021 Plan [Member] | Maximum                                                                    
Common Stock, Shares Subscribed but Unissued (in shares)                                                           200,000        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)   3 years 3 years     3 years 2 years 3 years 2 years                                                  
Share-based Payment Arrangement, Option [Member] | The 2021 Plan [Member] | French resident beneficiaries                                                                    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)       57,500                                                            
Share-based Payment Arrangement, Option [Member] | The 2021 Plan [Member] | CEO                                                                    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)             40,000                                                      
Share-based Payment Arrangement, Option [Member] | The Plan 2022                                                                    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)         3 years                                                          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares) 286,000                                     286,000                            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)     291,500                                                              
Shares Granted, Value, Share-based Payment Arrangement, before Forfeiture | €     € 2,963,000                                                              
Recognition period of non-cash financial charges     36 months                                                              
Period between date of grant and start of vesting period         6 months                                                          
Share-based Payment Arrangement, Option [Member] | The Plan 2022 | Maximum                                                                    
Common Stock, Shares Subscribed but Unissued (in shares)         600,000                                                          
Options to Subscribe New Shares [Member] | The 2012 Plan [Member]                                                                    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)                                                                   500,000
Options to Subscribe New Shares [Member] | The 2016 Plan [Member]                                                                    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)                                                                 1,000,000  
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    
Shares Granted, Value, Share-based Payment Arrangement, before Forfeiture | €                                         € 2,371,000                          
Options to Subscribe New Shares [Member] | The 2021 Plan [Member]                                                                    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)                                                           2,000,000        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares) 651,000                                     651,000                            
Common stock                                                                    
Stock Issued During Period, Shares, New Issues (in shares)                                       3,444,789 4,300,820 23,750                        
Common stock | American Depository Shares (ADS) [Member]                                                                    
Stock Issued During Period, Shares, New Issues (in shares)                               3,066,667 4,150,000                                  
Price per share | $ / shares                                                         $ 7.50   $ 6.75      
Gross Proceeds From Issuance of Stock | €                               € 23,913,000 € 23,255,000                                  
Issuance costs | €                               € 1,954,000 € 1,961,000