Note 12 - Segments - Long-lived Assets by Geographic Area (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Long-lived assets	$ 63,923	$ 68,863
UNITED STATES
Long-lived assets	26,748	27,377
CHINA
Long-lived assets	28,711	30,245
SLOVAKIA
Long-lived assets	5,514	5,726
SWITZERLAND
Long-lived assets	87	2,339
UNITED KINGDOM
Long-lived assets	1,715	2,053
All Other Foreign Countries [Member]
Long-lived assets	$ 1,148	$ 1,123