Note A - Overview and Significant Accounting Policies - Operations in Different Geographic (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019
Revenue	[1]	$ 176,900	$ 217,577
Property, plant and equipment	[2]	5,878	8,323
UNITED STATES
Revenue	[1]	156,688	194,230
Property, plant and equipment	[2]	5,495	7,221
Non-US [Member]
Revenue	[1]	20,212	23,347
Property, plant and equipment	[2]	$ 383	$ 1,102

[1] Geographic revenues are based on the location of the service being performed.

[2] Property, plant and equipment are based on physical location.