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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	9 Months Ended		12 Months Ended
	Sep. 30, 2018	Aug. 31, 2018	Mar. 31, 2020	Mar. 31, 2019	Sep. 30, 2019	Jun. 30, 2019
Payments to Acquire Businesses, Net of Cash Acquired, Total			$ (0)	$ 96,768
Goodwill, Ending Balance			$ 270,044			$ 273,843
Tenibac-Graphion, Inc. [Member]
Payments to Acquire Businesses, Gross	$ 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
Other acquired assets, adjustments					(1,253)
Inventories	324				324
Inventories, Adjustments					0
Customer Backlog	1,000				200
Customer Backlog, adjustments					(800)
Property, plant, & equipment	2,490				2,471
Property, plant, & equipment, Adjustments					(19)
Identifiable intangible assets	15,960	$ 16,900			16,860
Identifiable intangible assets, Adjustments					900
Goodwill, Ending Balance	32,949				34,360
Goodwill, Adjustments					1,411
Liabilities assumed	$ (1,020)				(1,259)
Liabilities assumed, Adjustments					$ (239)

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