Note 13 - Revenue by Product Group, by Significant Customer and by Geographic Location; Geographic Information - Net Tangible Long-lived Assets by Principal Geographic Areas (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Property and equipment, net	$ 50,613	$ 50,783
UNITED STATES
Property and equipment, net	48,611	48,635
ITALY
Property and equipment, net	$ 2,002	$ 2,148