Note O - Restructuring Activities (Details Textual) - 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 Charges, Total	$ 1,419	$ 3,080	$ 8,005	$ 10,867	$ 11,800
Restructuring and Related Cost, Expected Cost, Total	21,000		21,000
Restructuring and Related Cost, Expected Cost, Remainder of Fiscal Year	1,200		1,200
Employee Severance [Member]
Restructuring Charges, Total	641	1,116	2,053	1,760
Facility Related and Other Expenses [Member]
Restructuring Charges, Total	600		2,000	700
Capital Losses from Asset Disposal [Member]
Restructuring Charges, Total	154	26	1,294	589
Lease Impairment and Other Charges [Member]
Restructuring Charges, Total		1,300
Contract Termination [Member]
Restructuring Charges, Total		667		2,767
Lease Impairment and Termination Charges [Member]
Restructuring Charges, Total		$ 888	$ 2,974	956
Impairment Charge on Long-term Customer Databases [Member]
Restructuring Charges, Total				4,000
Asset Impairment Charge [Member]
Restructuring Charges, Total				$ 600