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Note 18 - Total Sales - Timing of Revenue Recognition (Details) - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Revenues € 44,859 € 39,163 € 35,686
Transferred at Point in Time [Member]      
Revenues 36,767 31,373 28,760
Transferred over Time [Member]      
Revenues € 8,092 € 7,790 € 6,927