Note 3 - Segment Information - Long-Lived Tangible Assets by Geographical Area (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Long-lived tangible assets	$ 113,777	$ 64,876
Operating Segments [Member]
Long-lived tangible assets	2,390	2,875
Operating Segments [Member] | UNITED STATES
Long-lived tangible assets	2,324	2,875
Operating Segments [Member] | Europe [Member]
Long-lived tangible assets	$ 66	$ 0