Note R - Segment and Geographic Information - Asset Information by Geographic Region (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Long-lived assets	$ 266,010	$ 244,002	$ 202,754
UNITED STATES
Long-lived assets	94,507	88,815	75,446
TAIWAN, PROVINCE OF CHINA
Long-lived assets	73,816	65,451	67,379
CHINA
Long-lived assets	$ 97,687	$ 89,736	$ 59,929