Note N - Restructuring Activities (Details Textual) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($) ft²	Dec. 31, 2019 USD ($)
Restructuring Charges, Total	$ 6,359	$ 9,374	$ 11,800
Restructuring and Related Cost, Expected Cost, Total	27,600
Employee Severance [Member]
Restructuring Charges, Total	2,482	2,495
Lease Impairment and Termination Charges [Member]
Restructuring Charges, Total	868	2,974
Facility Closing [Member]
Restructuring Charges, Total	2,976	2,884
Capital Losses from Asset Disposal [Member]
Restructuring Charges, Total	33	1,327
Adjustment to Contract Termination Fee [Member]
Restructuring Charges, Total	$ 0	$ (306)
Facility in Kansas City [Member]
Area of Real Estate Property (Square Foot) | ft²		400,000