Note 4 - Segment Information - Long-Lived Tangible Assets by Geographical Area (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Long-lived tangible assets	$ 66,520	$ 75,766
Operating Segments [Member]
Long-lived tangible assets	909	1,040
Operating Segments [Member] | UNITED STATES
Long-lived tangible assets	899	1,026
Operating Segments [Member] | Europe [Member]
Long-lived tangible assets	$ 10	$ 14