Note 4 - Segment Information - Long-Lived Tangible Assets by Geographical Area (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Long-lived tangible assets	$ 99,719	$ 80,552
Operating Segments [Member]
Long-lived tangible assets	1,445	1,570
Operating Segments [Member] | UNITED STATES
Long-lived tangible assets	1,414	1,535
Operating Segments [Member] | Europe [Member]
Long-lived tangible assets	$ 31	$ 35