Note N - Restructuring Activities - Restructuring Expense (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Restructuring expense	$ 1,366	$ 4,506	$ 11,800
Customer Dattbase Build Write-off [Member]
Restructuring expense		2,190
Contract Termination [Member]
Restructuring expense		2,100
Employee Severance [Member]
Restructuring expense	414	148
Facility, Asset Impairment and Other Expense [Member]
Restructuring expense	$ 952	$ 68