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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 6 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Jun. 30, 2017
Jun. 30, 2017
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2015
Total         $ 153,815 $ 13,700 $ 57,149
Goodwill $ 242,690   $ 242,690 $ 242,690 242,690 $ 157,354 $ 154,732
Horizon Scientific Inc. [Member]              
Cash payments   $ 26,457   26,457      
Identified cash and net working capital adjustment     341        
Identified cash and net working capital adjustment       341      
Less: cash acquired   (1,797)   (1,797)      
Total   24,660   25,001      
Total     341        
Current assets 4,863 4,863 4,863 4,863 4,863    
Inventories 4,470 4,470 4,470 4,470 4,470    
Property, plant, and equipment 1,616 1,616 1,616 1,616 1,616    
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles     (1,400)        
Identifiable intangible assets 16,150 17,550 16,150 16,150 16,150    
Goodwill, Purchase Accounting Adjustments 1,200   1,208        
Goodwill 6,660 5,452 6,660 6,660 6,660    
Liabilities assumed (2,374) (2,374) (2,374) (2,374) (2,374)    
Deferred taxes (6,384) (6,917) (6,384) (6,384) (6,384)    
Deferred taxes     533        
Total     341        
Total $ 25,001 $ 24,660 $ 25,001 $ 25,001 $ 25,001