Note O - Restructuring Activities - Restructuring Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Restructuring expense	$ 1,419	$ 3,080	$ 8,005	$ 10,867	$ 11,800
Customer Dattbase Build Write-off [Member]
Restructuring expense				4,036
Contract Termination [Member]
Restructuring expense		667		2,767
Adjustment to Contract Termination Fee [Member]
Restructuring expense			(306)
Employee Severance [Member]
Restructuring expense	641	1,116	2,053	1,760
Lease Impairment and Termination Charges [Member]
Restructuring expense		888	2,974	956
Capital Losses from Asset Disposal [Member]
Restructuring expense	154	26	1,294	589
Facility Closing [Member]
Restructuring expense	624	383	1,990	759
Facility, Asset Impairment and Other Expense [Member]
Restructuring expense	$ 778	$ 1,297	$ 6,258	$ 2,304