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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	Sep. 30, 2018	Aug. 31, 2019	Aug. 31, 2018	Jun. 30, 2019	Sep. 30, 2018	Sep. 30, 2017	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Sep. 30, 2019	Jun. 30, 2019	Sep. 30, 2018	Jun. 30, 2018
Payments to Acquire Businesses, Net of Cash Acquired, Total											$ 622		$ 127,924		$ 10,397
Goodwill, Ending Balance		$ 273,843				$ 273,843			$ 271,221	$ 273,843	$ 271,221		273,843		$ 204,091
Other Intangible Assets [Member]
Finite-Lived Intangible Asset, Useful Life (Year)											10 years
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
Other Payments to Acquire Businesses		500									500
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles											200
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
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
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				17,400		17,350		17,350	$ 13,718		$ 17,400
Goodwill, Ending Balance	20,142		16,400				16,400		16,434		16,434	20,142		16,400
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles									$ 3,632
Agile Magnetics [Member] | Trademarks [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total			3,800				3,800							3,800
Agile Magnetics [Member] | Customer Relationships [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total			13,500				$ 13,500							13,500
Finite-Lived Intangible Asset, Useful Life (Year)							13 years
Agile Magnetics [Member] | Noncompete Agreements [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total			100				$ 100							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
Goodwill, Ending Balance		34,360		$ 32,949		34,360				34,360			34,360
Business Acquisition, Goodwill, Expected Tax Deductible Amount		$ 34,400				$ 34,400				34,400			34,400
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles										$ 900
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] | 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] | 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
Piazza Rosa Group [Member]
Payments to Acquire Businesses, Net of Cash Acquired, Total			10,056				$ 900	$ 10,100				12,673
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total	3,472		4,087				4,087	4,100				3,472		4,087
Goodwill, Ending Balance	7,076		6,218				6,218					7,076		6,218
Other Payments to Acquire Businesses			0					2,800				2,617		2,600
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles								(600)				(615)
Piazza Rosa Group [Member] | Trademarks (Indefinite-Lived) [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total								1,600
Piazza Rosa Group [Member] | Customer Relationships [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total								$ 2,300
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life (Year)								8 years
Piazza Rosa Group [Member] | Other Intangible Assets [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total								$ 200
Horizon Scientific Inc. [Member]
Business Combination, Deferred Compensation Due on Second Anniversary			$ 2,800				$ 2,800							$ 2,800
Business Combination, Deferred Compensation Due on Third Anniversary	$ 5,600											$ 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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- 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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- Definition

Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (a)(3)
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X

- Definition

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

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-Name Accounting Standards Codification
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- Definition

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- Definition

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

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- 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
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X

- Definition

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-Publisher FASB
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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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