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Note 2 - Acquisitions (Details Textual) - USD ($) $ in Thousands				1 Months Ended	3 Months Ended				9 Months Ended			12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Aug. 31, 2018	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Sep. 30, 2018	Mar. 31, 2020	Sep. 30, 2019	Mar. 31, 2019	Sep. 30, 2019
Goodwill, Ending Balance	$ 273,843				$ 270,044		$ 273,843		$ 270,044
Payments to Acquire Businesses, Net of Cash Acquired, Total									(0)		$ 96,768
GS Engineering [Member]
Payments to Acquire Businesses, Gross	30,502						30,500		30,502
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total	8,910				9,110		8,910		9,110
Goodwill, Ending Balance	17,976				14,681		17,976		14,681
Payments to Acquire Businesses, Net of Cash Acquired, Total	29,880								29,880
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, Gross		$ 39,194								$ 39,194
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total		13,718				$ 17,350				17,350		$ 17,350
Goodwill, Ending Balance		20,142				16,434				16,434		16,434
Payments to Acquire Businesses, Net of Cash Acquired, Total		$ 39,193						$ 39,200		39,193
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, Gross			$ 57,284									57,284
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total			15,960	$ 16,900		$ 16,860		15,960		16,860		16,860
Goodwill, Ending Balance			32,949			$ 34,360		$ 32,949		$ 34,360		34,360
Payments to Acquire Businesses, Net of Cash Acquired, Total			$ 56,726	57,300								$ 56,726
Business Acquisition, Goodwill, Expected Tax Deductible Amount				34,400
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
Horizon Scientific Inc. [Member]
Business Combination, Deferred Compensation Due on Second Anniversary					2,800				2,800
Business Combination, Deferred Compensation Due on Third Anniversary					5,600				5,600
Business Combination, Deferred Compensation Arrangements					$ 0				$ 1,200

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.

+ Details

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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.

+ Details

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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.

+ Details

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X

- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=120321790&loc=d3e6927-128479

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X

- Definition

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

+ References

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-Publisher FASB
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-Section 50
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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(10)(1))
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X

- Definition

The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

+ References

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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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