Note N - Restructuring Activities (Details Textual) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2020 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)
Restructuring Charges, Total	$ 1,366	$ 4,506	$ 11,800
Asset Impairment Charges, Total		2,200
Gain (Loss) on Contract Termination		$ 2,100
Restructuring and Related Cost, Expected Number of Facilities Closed	3
Restructuring and Related Cost, Expected Cost, Total	$ 17,400