Note O - Restructuring Activities (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Restructuring Charges, Total	$ 5,219	$ 3,281	$ 6,585	$ 7,787	$ 11,800
Asset Impairment Charges, Total		600		600
Severance Costs		500	1,400	600
Restructuring and Related Cost, Expected Cost, Total	20,900		20,900
Restructuring and Related Cost, Expected Cost, Remainder of Fiscal Year	2,500		2,500
Lease Impairment and Termination Charges [Member]
Restructuring Charges, Total	2,626		2,974	68
Capital Losses from Asset Disposal [Member]
Restructuring Charges, Total	1,160	632	1,140	632
Impairment Charge on Long-term Customer Databases [Member]
Restructuring Charges, Total		1,800		4,000
Contract Termination [Member]
Restructuring Charges, Total				$ 2,100