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Note 12 - Segment Reporting - Long-lived Assets by Geographic Region (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Long-lived assets $ 210,053 $ 166,440
Operating Segments [Member] | United States Segment [Member]    
Long-lived assets 168,903 125,308
Operating Segments [Member] | Europe Segment [Member]    
Long-lived assets 33,783 33,691
Operating Segments [Member] | Japan Segment [Member]    
Long-lived assets $ 7,367 $ 7,441