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Note 1 - Summary of Significant Accounting Policies (Details Textual) - EUR (€)
€ / shares in Units, € in Thousands
12 Months Ended
Apr. 26, 2016
Apr. 14, 2016
May 28, 2013
Jan. 18, 2013
Mar. 28, 2012
Jun. 25, 2010
Oct. 29, 2007
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Feb. 18, 2016
Dec. 31, 2013
Dec. 19, 2012
Jun. 24, 2010
Dec. 31, 2007
May 22, 2007
Product Warranty Expense               € 319 € 354 € 429            
Research Tax Credit               511 448 518            
Advertising Expense               € 744 € 461 € 413            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross               575,000 0 0            
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options               € 605                
Employee Benefits and Share-based Compensation               € 360 € 66 € 140            
Maintenance Contracts, Useful Life               1 year                
Patents [Member]                                
Finite-Lived Intangible Asset, Useful Life               5 years                
Licensing Agreements [Member]                                
Finite-Lived Intangible Asset, Useful Life               5 years                
Trademarks and Trade Names [Member]                                
Finite-Lived Intangible Asset, Useful Life               7 years                
The 2007 Plan [Member]                                
Common Stock, Shares Subscribed but Unissued                               600,000
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               575,000            
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition               4 years 120 days                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number               1,427,438 917,188 1,095,850   1,310,850        
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           95,912 504,088                  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number               377,838                
Employee Stock Option [Member] | The 2007 Plan [Member] | October 29, 2007 Award [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross             504,088                  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Exercise Price             € 3.99                  
Equity Restrictions, Term of Holding Before Sale of Stock             4 years                  
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period             10 years                  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options                             € 1,731  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition             4 years                  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number               327,838                
Employee Benefits and Share-based Compensation               € 0 € 0 € 0            
Employee Stock Option [Member] | The 2007 Plan [Member] | June 25, 2010 Award [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross           95,912                    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Exercise Price           € 1.88                    
Equity Restrictions, Term of Holding Before Sale of Stock           4 years                    
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period           10 years                    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options           € 143                    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition           4 years                    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number               50,000                
Employee Benefits and Share-based Compensation               € 0 0 8            
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 Arrangement by Share-based Payment Award, Options, Grants in Period, Gross           229,100                    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Exercise Price           € 2.38                    
Equity Restrictions, Term of Holding Before Sale of Stock           4 years                    
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period           10 years                    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options                           € 328    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition           4 years                    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number               127,100                
Employee Benefits and Share-based Compensation               € 0 0 4            
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, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Exercise Price       € 1.91                        
Equity Restrictions, Term of Holding Before Sale of Stock       4 years                        
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period       10 years                        
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options                       € 660        
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition       4 years                        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number               362,500                
Employee Benefits and Share-based Compensation               € 29 € 66 € 128            
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 575,000                              
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Exercise Price € 3.22                              
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 10 years                              
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options               € 331                
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 4 years                              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number               560,000                
Employee Benefits and Share-based Compensation               € 331                
American Depository Shares (ADS) [Member] | Private Placement [Member]                                
Stock Issued During Period, Shares, New Issues   3,283,284 3,000,000   2,812,500                      
Maximum [Member]                                
Standard Product Warranty Period               2 years                
Maximum [Member] | Employee Stock Option [Member] | The 2007 Plan [Member] | October 29, 2007 Award [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period             4 years                  
Maximum [Member] | Employee Stock Option [Member] | The 2007 Plan [Member] | June 25, 2010 Award [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period           4 years                    
Maximum [Member] | Employee Stock Option [Member] | The 2010 Plan [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period           4 years                    
Maximum [Member] | Employee Stock Option [Member] | The 2012 Plan [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period       4 years                        
Maximum [Member] | Employee Stock Option [Member] | The 2016 Plan [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 4 years                              
Minimum [Member]                                
Standard Product Warranty Period               1 year                
Minimum [Member] | Employee Stock Option [Member] | The 2007 Plan [Member] | October 29, 2007 Award [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period             1 year                  
Minimum [Member] | Employee Stock Option [Member] | The 2007 Plan [Member] | June 25, 2010 Award [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period           1 year                    
Minimum [Member] | Employee Stock Option [Member] | The 2010 Plan [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period           1 year                    
Minimum [Member] | Employee Stock Option [Member] | The 2012 Plan [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period       1 year                        
Minimum [Member] | Employee Stock Option [Member] | The 2016 Plan [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 1 year                              
Devices Leased Under RPPs and Devices Subject to Sale and Leaseback Transactions [Member] | Maximum [Member]                                
Property, Plant and Equipment, Useful Life               7 years                
Leasehold Improvements [Member] | Maximum [Member]                                
Property, Plant and Equipment, Useful Life               10 years                
Equipment [Member] | Maximum [Member]                                
Property, Plant and Equipment, Useful Life               10 years                
Equipment [Member] | Minimum [Member]                                
Property, Plant and Equipment, Useful Life               3 years                
Furniture, Fixtures, Fittings, and Other [Member] | Maximum [Member]                                
Property, Plant and Equipment, Useful Life               10 years                
Furniture, Fixtures, Fittings, and Other [Member] | Minimum [Member]                                
Property, Plant and Equipment, Useful Life               2 years