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Note 16 - Shareholders' Equity (Details Textual) - EUR (€)
2 Months Ended 5 Months Ended 12 Months Ended
Aug. 29, 2018
Apr. 25, 2017
Apr. 26, 2016
Jan. 18, 2013
Jun. 25, 2010
Jun. 24, 2010
Jul. 31, 2001
Dec. 31, 1998
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2013
Feb. 18, 2016
Dec. 31, 2015
Dec. 19, 2012
May 22, 2007
Common Stock, Shares, Issued, Total                 29,368,394 29,368,394            
Common Stock, Par or Stated Value Per Share                 € 0.13 € 0.13            
Common Stock, Shares, Outstanding, Ending Balance                 28,997,866 28,997,866            
Statutory Retained Earnings (Statutory Accumulated Deficit)                 € (15,011,000)              
Treasury Stock, Shares, Ending Balance                 370,528 370,528            
Treasury Stock, Shares, Acquired             180,290 190,238                
Treasury Stock, Value, Acquired, Par Value Method             € 493,000 € 649,000                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross                 165,000              
Share Price                 € 1.85              
The 2010 Plan [Member]                                
Common Stock, Shares Subscribed but Unissued           229,100                    
The 2012 Plan [Member]                                
Common Stock, Shares Subscribed but Unissued                             500,000  
The 2016 Plan [Member]                                
Common Stock, Shares Subscribed but Unissued                         1,000,000      
Employee Stock Option [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross                 165,000 260,000 575,000          
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price                 € 2.65 € 2.39 € 3.22          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance                 1,347,600 1,207,600 1,427,438     917,188    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number                 772,600 598,850 774,938          
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options                 € 352,000              
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition                 3 years 240 days              
Employee Stock Option [Member] | The 2007 Plan [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized                               600,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross         95,912                      
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price         € 1.88                      
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period         10 years                      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance                 50,000              
Employee Stock Option [Member] | The 2007 Plan [Member] | Minimum [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period         1 year                      
Employee Stock Option [Member] | The 2007 Plan [Member] | Maximum [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period         4 years                      
Employee Stock Option [Member] | The 2010 Plan [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized           229,100                    
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price           € 2.38                    
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period           10 years                    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance                 120,100              
Employee Stock Option [Member] | The 2010 Plan [Member] | Minimum [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period           1 year                    
Employee Stock Option [Member] | The 2010 Plan [Member] | Maximum [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period           4 years                    
Employee Stock Option [Member] | The 2012 Plan [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized                             500,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross       500,000                        
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price       € 1.91                        
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period       10 years                        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance                 297,500              
Stock Granted, Value, Share-based Compensation, Gross                       € 660,000        
Allocated Share-based Compensation Expense, Total                 € 0 € 2,000 € 29,000          
Employee Stock Option [Member] | The 2012 Plan [Member] | Minimum [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period       1 year                        
Employee Stock Option [Member] | The 2012 Plan [Member] | Maximum [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period       4 years                        
Employee Stock Option [Member] | The 2016 Plan [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized                         1,000,000      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 165,000 260,000 575,000                          
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price € 2.65 € 2.39 € 3.22                          
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 10 years 10 years 10 years                          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance                 880,000              
Stock Granted, Value, Share-based Compensation, Gross € 219,000                 335,000 960,000          
Allocated Share-based Compensation Expense, Total                 € 289,000 € 380,000 € 331,000          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number                 305,000              
Employee Stock Option [Member] | The 2016 Plan [Member] | Minimum [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 1 year 1 year 1 year                          
Employee Stock Option [Member] | The 2016 Plan [Member] | Maximum [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 4 years 4 years 4 years                          
The 2007 Plan [Member]                                
Common Stock, Shares Subscribed but Unissued                               600,000
Treasury Stock, Held for Purchase for Option Holder Exercises [Member]                                
Treasury Stock, Shares, Ending Balance                 120,100              
Treasury Stock, Reissuance Price Per Share                 € 2.38