Note O - Restructuring Activities - Restructuring Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Restructuring expense	$ 9,374	$ 11,799
Customer Dattbase Build Write-off [Member]
Restructuring expense		4,036
Contract Termination [Member]
Restructuring expense		3,101
Adjustment to Contract Termination Fee [Member]
Restructuring expense	(306)
Employee Severance [Member]
Restructuring expense	2,495	2,098
Lease Impairment and Termination Charges [Member]
Restructuring expense	2,974	956
Capital Losses from Asset Disposal [Member]
Restructuring expense	1,327	350
Facility Closing [Member]
Restructuring expense	2,884	1,258
Facility, Asset Impairment and Other Expense [Member]
Restructuring expense	$ 7,185	$ 2,564