Note 12 - Segment Reporting - Long-lived Assets by Geographic Region (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Long-lived assets	$ 283,019	$ 282,666
Operating Segments [Member]
Long-lived assets	283,019	282,666
Operating Segments [Member] | United States Segment [Member]
Long-lived assets	216,996	215,721
Operating Segments [Member] | Europe Segment [Member]
Long-lived assets	60,187	59,388
Operating Segments [Member] | Japan Segment [Member]
Long-lived assets	$ 5,836	$ 7,557