Note 12 - Segments - Long-lived Assets by Geographic Area (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Long-lived assets	$ 68,863	$ 70,013
UNITED STATES
Long-lived assets	27,377	27,505
CHINA
Long-lived assets	30,245	29,563
SLOVAKIA
Long-lived assets	5,726	6,475
SWITZERLAND
Long-lived assets	2,339	3,023
UNITED KINGDOM
Long-lived assets	2,053	2,330
All Other Foreign Countries [Member]
Long-lived assets	$ 1,123	$ 1,117