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Note 2 - Acquisitions (Details Textual) - USD ($) $ in Thousands		3 Months Ended				9 Months Ended
		Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2017	Mar. 31, 2016	Jun. 30, 2016
Payments to Acquire Businesses, Net of Cash Acquired						$ 153,815	$ 13,700
Goodwill		$ 237,751				237,751		$ 157,354
Amortization of Intangible Assets		1,100		$ 1,000		3,100	2,600
Interest Expense		953		807		2,499	2,182
Business Combination, Acquisition Related Costs		4,719				5,520
Business Combination, Contingent Consideration, Liability	[1]	1,406				1,406
Business Combination, Deferred Compensation Arrangements		703				$ 1,405
Standex Electronics Japan Corporation [Member]
Payments to Acquire Businesses, Net of Cash Acquired		$ 129,155
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		$ 53,800				$ 53,800
Goodwill		75,985				75,985
Business Combination, Acquisition Related Costs		3,100				3,600
Standex Electronics Japan Corporation [Member] | Investor Banker Fees [Member]
Business Combination, Acquisition Related Costs		2,800
Standex Electronics Japan Corporation [Member] | Third Party Due Diligence Expenses [Member]
Business Combination, Acquisition Related Costs		1,900
Standex Electronics Japan Corporation [Member] | Fair Value Adjustment to Intangible Assets [Member]
Amortization of Intangible Assets		600		600		1,800	1,800
Standex Electronics Japan Corporation [Member] | Fair Value Adjustment to Fixed Assets [Member]
Depreciation		400		400		1,100	1,100
Standex Electronics Japan Corporation [Member] | Fair Value Adjustment to Credit Facility [Member]
Interest Expense		300		$ 300		800	$ 800
Standex Electronics Japan Corporation [Member] | Developed Technology Rights [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles		$ 50,100				50,100
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		20 years
Standex Electronics Japan Corporation [Member] | Customer Relationships [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles		$ 3,600				3,600
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		15 years
Standex Electronics Japan Corporation [Member] | Order or Production Backlog [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles		$ 100				100
Horizon Scientific Inc. [Member]
Payments to Acquire Businesses, Net of Cash Acquired			$ 24,700			24,660
Business Acquisition, Percentage of Voting Interests Acquired			100.00%
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill		17,550	$ 17,600			17,550
Goodwill		5,452	5,500			5,452
Business Combination, Contingent Consideration, Liability			8,400
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		$ 700				$ 1,400
Horizon Scientific Inc. [Member] | Trademarks [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets			1,200
Horizon Scientific Inc. [Member] | Customer Relationships [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles			$ 16,100
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life			15 years
Horizon Scientific Inc. [Member] | Order or Production Backlog [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles			$ 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%
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill					$ 6,824
Goodwill					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
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
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
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.

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

+ References

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- Definition

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

+ References

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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

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-Paragraph 1
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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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- Definition

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

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X

- Definition

This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

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

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

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

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

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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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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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