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Note 2 - Acquisitions - Components of Fair Value of Acquisitions and Allocation of Purchase Price For Acquisition of Agile Magnetics (Details) - USD ($) $ in Thousands		3 Months Ended	6 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Sep. 30, 2019	Jun. 30, 2019
Payments to Acquire Businesses, Net of Cash Acquired, Total			$ (0)	$ 95,918
Goodwill, Ending Balance			$ 282,207			$ 281,503
Agile Magnetics [Member]
Payments to Acquire Businesses, Gross	$ 39,194				$ 39,194
Less, cash acquired	(1)				(1)
Payments to Acquire Businesses, Net of Cash Acquired, Total	39,193	$ 39,200			39,193
Other acquired assets	1,928	1,928			1,893
Other acquired assets					(35)
Inventories	2,506	2,506			2,774
Inventories, Adjustments					268
Customer Backlog	0	0			200
Customer Backlog, Adjustments					200
Property, plant, & equipment	1,318	1,318			970
Property, plant, & equipment, Adjustments					(348)
Identifiable intangible assets	13,718	13,718			17,350
Identifiable intangible assets, Adjustments					3,632
Goodwill, Ending Balance	20,142	20,142			16,434
Goodwill, Adjustments					(3,708)
Liabilities assumed	$ (419)	$ (419)			(428)
Liabilities assumed, Adjustments					$ (9)

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