Note 18 - Segment Reporting - Long-lived Assets by Geographic Region (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Long-lived assets	$ 280,346	$ 282,666	$ 263,712
Operating Segments [Member] | United States Segment [Member]
Long-lived assets	215,701	215,721	210,171
Operating Segments [Member] | Europe Segment [Member]
Long-lived assets	59,388	59,388	45,019
Operating Segments [Member] | Japan Segment [Member]
Long-lived assets	$ 5,257	$ 7,557	$ 8,522