Note 4 - Segment Information - Long-Lived Tangible Assets by Geographical Area (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Long-lived tangible assets	$ 85,024	$ 80,552
Operating Segments [Member]
Long-lived tangible assets	1,159	1,570
Operating Segments [Member] | UNITED STATES
Long-lived tangible assets	1,139	1,535
Operating Segments [Member] | Europe [Member]
Long-lived tangible assets	$ 20	$ 35