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Note 18 - Segment Reporting - Expenditures for Additions to Long-lived Assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Expenditures for additions to long-lived assets $ 87,104 $ 32,635 $ 33,616
UNITED STATES      
Expenditures for additions to long-lived assets 78,762 20,370 21,190
Europe [Member]      
Expenditures for additions to long-lived assets 7,576 11,704 5,954
JAPAN      
Expenditures for additions to long-lived assets $ 766 $ 561 $ 6,472