Note 4 - Segment Information - Long-Lived Tangible Assets by Geographical Area (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Long-lived tangible assets	$ 101,026	$ 113,777
Operating Segments [Member]
Long-lived tangible assets	2,024	2,390
Operating Segments [Member] | UNITED STATES
Long-lived tangible assets	1,966	2,324
Operating Segments [Member] | Europe [Member]
Long-lived tangible assets	$ 58	$ 66