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SHAREHOLDERS' EQUITY (Details) - EUR (€)
€ / shares in Units, € in Thousands
2 Months Ended 5 Months Ended 12 Months Ended
Apr. 26, 2019
Apr. 04, 2019
Aug. 29, 2018
Apr. 25, 2017
Apr. 26, 2016
Jan. 18, 2013
Jul. 31, 2001
Dec. 31, 1998
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2013
Jun. 28, 2019
Feb. 18, 2016
Dec. 31, 2012
Common stock, shares issued                 29,457,744 29,433,994              
Common stock, par value                 € 0.13 € 0.13              
Commons stock, shares outstanding                 29,165,316 29,141,566              
Statutory Retained Earnings (Statutory Accumulated Deficit)                 € 16,172                
Treasury stock                 292,428 292,428              
Treasury Stock, Shares, Acquired (in shares)             180,290 112,138                  
Treasury Stock, Value, Acquired, Par Value Method             € 928                    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)                 0 155,000 165,000            
Share Price (in EUR per share)                 € 5.17                
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  
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)                   € 3.90 € 2.65            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)                 1,186,900 1,273,900 1,347,600 1,207,600          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)                   155,000 165,000            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number (in shares)                 970,650 818,900 772,600            
Stock issued during period shares stock options exercised                 23,750 143,700              
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount                 € 105                
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)                 3 years 3 months                
Share-based Payment Arrangement, Option [Member] | The 2012 Plan [Member]                                  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)                                 500,000
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in EUR per share)           € 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)                 262,500                
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      
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 1,000,000  
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in EUR per share)   € 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                          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)                 924,400                
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 € 219                 € 335 € 960        
Share-based Payment Arrangement, Expense                 € 160 € 260 € 289            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number (in shares)                 708,150                
Stock issued during period shares stock options exercised                 13,750                
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                
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