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Note A - Overview and Significant Accounting Policies - Operations in Different Geographic (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Revenue [1] $ 194,596 $ 176,900
Property, plant and equipment [2] 7,747 5,878
UNITED STATES    
Revenue [1] 175,437 156,688
Property, plant and equipment [2] 7,549 5,495
Non-US [Member]    
Revenue [1] 19,159 20,212
Property, plant and equipment [2] $ 198 $ 383
[1] Geographic revenues are based on the location of the service being performed.
[2] Property, plant and equipment are based on physical location.