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Note 1 - Summary of Significant Accounting Policies (Details Textual) - EUR (€)
€ in Thousands, shares in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jan. 01, 2019
Product Warranty Expense   € 433 € 316 € 319  
Advertising Expense   € 719 € 672 € 744  
Class of Warrant or Right, Outstanding   0      
Subsequent Event [Member] | Accounting Standards Update 2016-02 [Member]          
Operating Lease, Right-of-Use Asset         € 2,900
Operating Lease, Liability, Total         € 2,900
Minimum [Member]          
Revenue from Contract with Customer, Customer Payment Period   30 days      
Standard Product Warranty Period   1 year 1 year    
Maximum [Member]          
Revenue from Contract with Customer, Customer Payment Period   90 days      
Standard Product Warranty Period   2 years 2 years    
Maximum [Member] | Devices Leased Under RPPs and Devices Subject to Sale and Leaseback Transactions [Member]          
Property, Plant and Equipment, Useful Life 7 years