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Note 17 - Shareholders' Equity (Details Textual) - EUR (€)
€ / shares in Units, € in Thousands
2 Months Ended 5 Months Ended 12 Months Ended
Apr. 04, 2019
Aug. 29, 2018
Apr. 25, 2017
Apr. 26, 2016
Jan. 18, 2013
Jun. 24, 2010
Jul. 31, 2001
Dec. 31, 1998
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2013
Jun. 28, 2019
Feb. 18, 2016
Dec. 19, 2012
Common Stock, Shares, Issued, Total (in shares)                 29,433,994 29,368,394            
Common Stock, Par or Stated Value Per Share (in EUR per share)                 € 0.13 € 0.13            
Common Stock, Shares, Outstanding, Ending Balance (in shares)                 29,141,566 28,997,866            
Statutory Retained Earnings (Statutory Accumulated Deficit)                 € (15,392)              
Treasury Stock, Shares, Ending Balance (in shares)                 292,428 370,528            
Treasury Stock, Shares, Acquired (in shares)             180,290 112,138                
Treasury Stock, Value, Acquired, Par Value Method             € 718                  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)                 155,000              
Share Price (in EUR per share)                 € 4.43              
The 2010 Plan [Member]                                
Common Stock, Shares Subscribed but Unissued (in shares)           229,100                    
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 € 2.39          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)                 1,273,900 1,347,600 1,207,600 1,427,438        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)                 155,000 165,000 260,000          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number (in shares)                 818,900 772,600 598,850          
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount                 € 271              
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)                 3 years 91 days              
Share-based Payment Arrangement, Option [Member] | The 2010 Plan [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)           229,100                    
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in EUR per share)           € 2.38                    
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)                 42,000              
Share-based Payment Arrangement, Option [Member] | The 2010 Plan [Member] | Minimum [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)           1 year                    
Share-based Payment Arrangement, Option [Member] | The 2010 Plan [Member] | Maximum [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)           4 years                    
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)                 282,500              
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, Expense                 € 0 € 0 € 2          
Share-based Payment Arrangement, Option [Member] | The 2012 Plan [Member] | Minimum [Member]                                
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 [Member]                                
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) € 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)                 949,400              
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                 € 260 € 289 € 380          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number (in shares)                 494,400              
Share-based Payment Arrangement, Option [Member] | The 2016 Plan [Member] | Minimum [Member]                                
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 [Member]                                
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    
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    
Treasury Stock, Held for Purchase for Option Holder Exercises [Member]                                
Treasury Stock, Shares, Ending Balance (in shares)                 42,000              
Treasury Stock, Reissuance Price Per Share (in EUR per share)                 € 2.38              
Treasury Stock, Allocated by Board of Directors in Future [Member]                                
Treasury Stock, Shares, Ending Balance (in shares)                 250,428