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Note 2 - Acquisitions - Components of Fair Value of Acquisitions and Allocation of Purchase Price For Acquisition of Horizon (Details) - USD ($)
$ in Thousands
3 Months Ended
Jun. 30, 2017
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Total   $ 10,397  
Goodwill $ 242,690 $ 248,557    
Horizon Scientific Inc. [Member]        
Cash payments 26,457      
Identified cash and net working capital adjustment 341      
Less: cash acquired (1,797)      
Total 25,001   $ 24,700  
Current assets 4,863      
Inventories 4,470      
Property, plant, and equipment 1,616      
Identifiable intangible assets 16,150   $ 16,200  
Goodwill 6,660      
Liabilities assumed (2,374)      
Deferred taxes (6,384)      
Total $ 25,001