Note N - Restructuring Activities - Restructuring Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Restructuring expense	$ 937	$ 1,419	$ 4,880	$ 8,005
Adjustment to Contract Termination Fee [Member]
Restructuring expense	0	0	0	(306)
Employee Severance [Member]
Restructuring expense	116	641	1,530	2,053
Lease Impairment and Termination Charges [Member]
Restructuring expense	425	0	718	2,974
Capital Losses from Asset Disposal [Member]
Restructuring expense	(8)	154	(2)	1,294
Facility Closing [Member]
Restructuring expense	404	624	2,634	1,990
Facility, Asset Impairment and Other Expense [Member]
Restructuring expense	$ 821	$ 778	$ 3,350	$ 6,258