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Note 12 - Revenue by Product Group, by Significant Customer and by Geographic Region; Geographic Information - Net Tangible Long-lived Assets by Principal Geographic Areas (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Property and equipment, net $ 50,783 $ 54,111
UNITED STATES    
Property and equipment, net 48,635 51,385
ITALY    
Property and equipment, net $ 2,148 $ 2,726