Note R - Segment and Geographic Information - Revenue Information by Geographic Region (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenue, net	$ 48,658	$ 46,084	$ 43,411	$ 52,719	$ 58,018	$ 56,386	$ 87,822	$ 65,239	$ 190,872	$ 267,465	$ 382,329
UNITED STATES
Revenue, net									9,795	10,795	18,209
TAIWAN, PROVINCE OF CHINA
Revenue, net									97,776	113,547	241,820
CHINA
Revenue, net									$ 83,301	$ 143,123	$ 122,300