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Note 8 - Goodwill and Other Intangible Assets - Major Components of Goodwill and Other Intangible Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Intangible assets, cost $ 16,590 $ 20,349  
Intangible assets, accumulated amortization 8,933 8,396  
Goodwill 27,551 28,030 $ 24,559
Intangible assets, including goodwill, cost 46,851 51,267  
Trademarks and Trade Names [Member]      
Trade names and trademarks 2,710 2,888  
Customer Relationships [Member]      
Intangible assets, cost 7,966 11,885  
Intangible assets, accumulated amortization 4,791 4,650  
Technology and Drawings [Member]      
Intangible assets, cost 6,758 6,741  
Intangible assets, accumulated amortization 3,121 2,804  
Other Intangible Assets [Member]      
Intangible assets, cost 1,866 1,723  
Intangible assets, accumulated amortization $ 1,021 $ 942