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Note 2 - Acquisitions (Details Textual) - USD ($) $ in Thousands			1 Months Ended		3 Months Ended			9 Months Ended	10 Months Ended	12 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Aug. 31, 2019	Aug. 31, 2018	Mar. 31, 2021	Jun. 30, 2019	Sep. 30, 2018	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019	Sep. 30, 2020
Payments to Acquire Businesses, Net of Cash Acquired, Total										$ 27,406	$ 622	$ 127,924
Operating Lease, Right-of-Use Asset								$ 44,788		37,276	44,788
Operating Lease, Liability, Current								8,016		7,933	8,016
Operating Lease, Liability, Noncurrent								36,293		29,041	36,293
Goodwill, Ending Balance								271,221		$ 278,054	271,221
Other Intangible Assets [Member]
Finite-Lived Intangible Asset, Useful Life (Year)										10 years
Renco Electronics [Member]
Payments to Acquire Businesses, Net of Cash Acquired, Total					$ 27,400
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total					10,400					$ 10,400			$ 10,400
Business Acquisition, Goodwill, Expected Tax Deductible Amount					14,000
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Lease Liabilities					100
Operating Lease, Right-of-Use Asset					3,300
Operating Lease, Liability, Current					1,800
Operating Lease, Liability, Noncurrent					1,500
Goodwill, Ending Balance										$ 13,991			$ 14,153
Renco Electronics [Member] | Customer Relationships [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total					$ 6,800
Finite-Lived Intangible Asset, Useful Life (Year)					12 years
Renco Electronics [Member] | Indefinite Trademarks [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total					$ 3,600
GS Engineering [Member]
Payments to Acquire Businesses, Net of Cash Acquired, Total		$ 29,880									30,502
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total		8,910				$ 8,910		9,110	$ 8,910		9,110	8,910
Goodwill, Ending Balance		17,976				$ 17,976		15,458	17,976		15,458	17,976
GS Engineering [Member] | Customer Relationships [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total								2,600			2,600
Finite-Lived Intangible Asset, Useful Life (Year)						12 years
GS Engineering [Member] | Developed Technology Rights [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total								5,600			5,600
Finite-Lived Intangible Asset, Useful Life (Year)						15 years
GS Engineering [Member] | Trademarks [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total								900			900
Agile Magnetics [Member]
Payments to Acquire Businesses, Net of Cash Acquired, Total	$ 39,193						$ 39,200	39,193
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total	13,718						17,400	17,350			17,350
Goodwill, Ending Balance	20,142						16,400	$ 16,434			16,434
Agile Magnetics [Member] | Customer Relationships [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total							$ 13,500
Finite-Lived Intangible Asset, Useful Life (Year)							13 years
Agile Magnetics [Member] | Trademarks [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total							$ 3,800
Agile Magnetics [Member] | Noncompete Agreements [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total							$ 100
Finite-Lived Intangible Asset, Useful Life (Year)							5 years
Tenibac-Graphion, Inc. [Member]
Payments to Acquire Businesses, Net of Cash Acquired, Total			$ 56,726	$ 57,300					56,726
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total		16,860	15,960	16,900		$ 16,860			16,860			16,860
Business Acquisition, Goodwill, Expected Tax Deductible Amount		34,400				34,400			34,400			34,400
Goodwill, Ending Balance		$ 34,360	$ 32,949			$ 34,360			$ 34,360			34,360
Tenibac-Graphion, Inc. [Member] | Customer Relationships [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total				$ 11,300
Finite-Lived Intangible Asset, Useful Life (Year)				15 years
Tenibac-Graphion, Inc. [Member] | Trademarks [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total				$ 4,200
Tenibac-Graphion, Inc. [Member] | Other Intangible Assets [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total				$ 1,400
Finite-Lived Intangible Asset, Useful Life (Year)				5 years
Horizon Scientific Inc. [Member]
Business Combination, Deferred Compensation Due on Second Anniversary							$ 2,800
Business Combination, Deferred Compensation Due on Third Anniversary	$ 5,600
Business Combination, Deferred Compensation Arrangements											$ 1,200	$ 2,800

X

- Definition

This element represents acquisition-related costs incurred due to the effect of deferred compensation arrangements made in the course of the acquisition.

+ References

No definition available.

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X

- Definition

Amount of acquisition-related costs incurred as a result of deferred compensation arrangements due on the second anniversary.

+ References

No definition available.

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X

- Definition

Amount of acquisition-related costs incurred as a result of deferred compensation arrangements due on the third anniversary.

+ References

No definition available.

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X

- Definition

This element represents the amount of any measurement period adjustment (as defined) realized during the reporting period to lease liabilities assumed in connection with a business combination for which the initial accounting was incomplete.

+ References

No definition available.

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- Definition

The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes.

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X

- Definition

Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

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X

- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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- Definition

Present value of lessee's discounted obligation for lease payments from operating lease, classified as current.

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The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

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