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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 ($)
 1 Months Ended 3 Months Ended
Sep. 30, 2018
Aug. 31, 2018
Sep. 30, 2018
Sep. 30, 2017
Jun. 30, 2018
Payments to Acquire Businesses, Net of Cash Acquired, Total     $ 96,828,000 $ 10,397,000  
Goodwill, Ending Balance $ 263,021,000   263,021,000   $ 211,751,000
Tenibac-Graphion, Inc. [Member]          
Cash payments 57,284        
Less cash acquired (558)        
Payments to Acquire Businesses, Net of Cash Acquired, Total 56,726,000 $ 57,300,000      
Other acquired assets 5,023,000   5,023,000    
Inventories 324,000   324,000    
Customer backlog 1,000,000   1,000,000    
Property, plant, and equipment 2,490,000   2,490,000    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total 15,960,000 16,000,000 15,960,000    
Goodwill, Ending Balance 32,949,000 $ 32,900,000 32,949,000    
Liabilities assumed (1,020,000)   (1,020,000)    
Total $ 56,726   $ 56,726