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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 10 Months Ended 12 Months Ended
Aug. 31, 2019
Aug. 31, 2018
Jun. 30, 2019
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Payments to Acquire Businesses, Net of Cash Acquired, Total       $ 27,406 $ 622 $ 127,924
Goodwill, Ending Balance       $ 278,054 $ 271,221  
Tenibac-Graphion, Inc. [Member]            
Cash payments $ 57,284   $ 57,284      
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   3,770     3,770
Other acquired assets, Adjustments     (1,253)      
Inventories 324   324     324
Inventories, Adjustments     0      
Customer Backlog 1,000   200     200
Customer Backlog, Adjustments     (800)      
Property, plant, & equipment 2,490   2,471     2,471
Property, plant, & equipment, Adjustments     (19)      
Identifiable intangible assets 15,960 $ 16,900 16,860     16,860
Identifiable intangible assets, Adjustments     900      
Goodwill, Ending Balance 32,949   34,360     34,360
Goodwill, Adjustments     1,411      
Liabilities assumed $ (1,020)   (1,259)     $ (1,259)
Liabilities assumed, Adjustments     $ (239)