Note O - Income Taxes - Provision for Income Tax Expense (Benefit) (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
Federal									$ 0	$ 0	$ 0
State									16	80	(292)
Foreign									97	1,349	10,965
Total									113	1,429	10,673
Federal									16,375	(6,391)	2,015
State									1,716	61	(1,669)
Foreign									(3,542)	(2,731)	(444)
Total									14,549	(9,061)	(98)
Income tax (benefit) expense	$ 22,267	$ (1,940)	$ (3,191)	$ (2,474)	$ (3,638)	$ (5,294)	$ 2,296	$ (996)	$ 14,662	$ (7,632)	$ 10,575