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Note H - Goodwill and Other Intangible Assets - Major Components of Goodwill and Other Intangible Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Intangible assets, cost $ 20,349 $ 21,857  
Intangible assets, accumulated amortization 8,396 8,419  
Goodwill 28,030 24,559 $ 22,615
Intangible assets, including goodwill, cost 51,267 49,482  
Trademarks and Trade Names [Member]      
Trade names and trademarks 2,888 3,066  
Customer Relationships [Member]      
Intangible assets, cost 11,885 12,706  
Intangible assets, accumulated amortization 4,650 4,430  
Technology and Drawings [Member]      
Intangible assets, cost 6,741 6,745  
Intangible assets, accumulated amortization 2,804 2,412  
Other Intangible Assets [Member]      
Intangible assets, cost 1,723 2,406  
Intangible assets, accumulated amortization $ 942 $ 1,577