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Note 2 - Acquisitions - Components of Fair Value of Acquisitions and Allocation of Purchase Price For Acquisition of Tennibac-Graphion Inc. (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Sep. 30, 2018
Aug. 31, 2018
Dec. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Jun. 30, 2018
Payments to Acquire Businesses, Net of Cash Acquired, Total       $ 95,918 $ 10,397  
Goodwill, Ending Balance     $ 261,569 261,569   $ 211,751
Tenibac-Graphion, Inc. [Member]            
Cash payments $ 57,284   57,824      
Less, cash acquired (558)   (558)      
Payments to Acquire Businesses, Net of Cash Acquired, Total 56,726 $ 57,300 56,726      
Other acquired assets 5,023   4,374 4,374    
Other acquired assets     (649)      
Inventories 324   324 324    
Inventories          
Customer Backlog 1,000   200 200    
Customer Backlog     (800)      
Property, plant, & equipment 2,490   2,490 2,490    
Property, plant, & equipment          
Identifiable intangible assets 15,960 16,900 16,860 16,860    
Identifiable intangible assets     900      
Goodwill, Ending Balance 32,949 $ 33,700 33,748 33,748    
Goodwill     799      
Liabilities assumed (1,020)   (1,270) (1,270)    
Liabilities assumed     (250)      
Total $ 56,726   $ 56,726 $ 56,726