Note P - Share-based Compensation - Restricted Stock Unit/Awards Activity (Details) - Restricted Stock Units (RSUs) [Member] - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Outstanding, number of shares (in shares)	826
Outstanding, weighted average fair value (in dollars per share)	$ 32.07
Outstanding, aggregate intrinsic value	$ 9,143	$ 12,744
Granted, number of shares (in shares)	445
Granted, weighted average fair value (in dollars per share)	$ 13.30
Granted, aggregate intrinsic value	$ 6
Released, number of shares (in shares)	(452)
Released, weighted average share price on date of release (in dollars per share)	$ 25.95
Released, weighted average fair value (in dollars per share)	$ 25.95
Released, aggregate intrinsic value	$ 6
Cancelled/Forfeited, number of shares (in shares)	(49)
Cancelled/Forfeited, weighted average fair value (in dollars per share)	$ 26.17
Cancelled/Forfeited, aggregate intrinsic value	$ 584
Outstanding, number of shares (in shares)	770
Outstanding, weighted average fair value (in dollars per share)	$ 25.18
Vested and expected to vest, number of shares (in shares)	770
Vested and expected to vest, weighted average fair value (in dollars per share)	$ 25.18
Vested and expected to vest, aggregate intrinsic value	$ 9,143