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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, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2019
Product Warranty Expense   € 131 € 433 € 316  
Advertising Expense   € 739 € 719 € 672  
Class of Warrant or Right, Outstanding (in shares)   0 0    
Operating Lease, Liability, Total   € 2,684      
Operating Lease, Right-of-Use Asset   € 2,647    
Accounting Standards Update 2016-02 [Member]          
Operating Lease, Liability, Total         € 35,000
Operating Lease, Right-of-Use Asset         € 35,000
Minimum [Member]          
Revenue from Contract with Customer, Customer Payment Period (Month)   30 days      
Standard Product Warranty Period (Year)   1 year      
Maximum [Member]          
Revenue from Contract with Customer, Customer Payment Period (Month)   90 days      
Standard Product Warranty Period (Year)   2 years      
Maximum [Member] | Devices Leased Under RPPs and Devices Subject to Sale and Leaseback Transactions [Member]          
Property, Plant and Equipment, Useful Life (Year) 7 years