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Note 2 - Acquisitions (Details Textual) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Jun. 30, 2016
Payments to Acquire Businesses, Net of Cash Acquired				$ 24,660	$ 13,544
Business Combination, Contingent Consideration, Liability	[1]	$ 703		703
Goodwill		161,017		161,017		$ 157,354
Business Combination, Deferred Compensation Arrangements		703		$ 703
Horizon Scientific Inc. [Member]
Payments to Acquire Businesses, Net of Cash Acquired		$ 24,660
Business Acquisition, Percentage of Voting Interests Acquired		100.00%		100.00%
Business Combination, Contingent Consideration, Liability		$ 8,400		$ 8,400
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill		17,550		17,550
Goodwill		5,452		5,452
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		700		700
Horizon Scientific Inc. [Member] | Trademarks [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets		1,200		1,200
Horizon Scientific Inc. [Member] | Customer Relationships [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles		$ 16,100		16,100
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		15 years
Horizon Scientific Inc. [Member] | Product Order Backlog [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles		$ 300		$ 300
Wisconsin-based Northlake Engineering, Inc [Member]
Payments to Acquire Businesses, Net of Cash Acquired			$ 13,700
Business Acquisition, Percentage of Voting Interests Acquired			100.00%		100.00%
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill			$ 6,824		$ 6,824
Goodwill			5,121		5,121
Wisconsin-based Northlake Engineering, Inc [Member] | Trademarks [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill			2,400		2,400
Wisconsin-based Northlake Engineering, Inc [Member] | Customer Relationships [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill			$ 4,100		4,100
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life			12 years 182 days
Wisconsin-based Northlake Engineering, Inc [Member] | Noncompete Agreements [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles			$ 300		$ 300
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life			5 years
[1] The fair value of our contingent consideration arrangement is determined based on our evaluation as to the probability and amount of any deferred compensation that has been earned to date.

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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Namespace Prefix:	sxi_
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X

- 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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275

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X

- Definition

Percentage of voting equity interests acquired at the acquisition date in the business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1392-128463

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X

- Definition

Amount of liability recognized arising from contingent consideration in a business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
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-Section 25
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X

- Definition

Amount of assets, excluding financial assets and goodwill, that lack physical substance, having a projected indefinite period of benefit, acquired at the acquisition date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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X

- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-Paragraph 1
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X

- Definition

The amount of identifiable intangible assets recognized as of the acquisition date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 55
-Paragraph 37
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X

- 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/presentationRef
-Publisher FASB
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-Paragraph 1
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X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Glossary Investing Activities
-URI http://asc.fasb.org/extlink&oid=6516133

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