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Note 2 - Acquisitions (Details Textual) - USD ($) $ in Thousands |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2017 | Mar. 31, 2017 | Oct. 01, 2015 | Sep. 30, 2018 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Jun. 30, 2018 | Jun. 30, 2016 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016
Payments to Acquire Businesses, Net of Cash Acquired, Total |  |  |  |  |  |  |  |  |  |  |  | $ 10,397 | $ 153,815 | $ 13,700
Business Combination, Contingent Consideration, Liability, Total | [1] |  |  |  |  |  | $ 2,108 |  |  | $ 7,535 |  | 7,535 | 2,108 |
Goodwill, Ending Balance |  |  |  |  |  |  | 242,690 |  |  | 251,762 | $ 157,354 | 251,762 | 242,690 | 157,354
Business Combination, Acquisition Related Costs |  |  |  |  |  |  |  |  |  |  |  | 3,749 | 7,843 |
Amortization of Intangible Assets, Total |  |  |  |  |  |  |  |  |  |  |  | 9,000 | 5,000 | 3,600
Depreciation, Total |  |  |  |  |  |  |  |  |  |  |  | 18,800 | 14,700 | 13,700
Interest Expense, Total |  |  |  |  |  |  |  |  |  |  |  | 8,030 | 4,043 | 2,871
Acquisition-related Costs [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Acquisition Related Costs |  |  |  |  |  |  |  |  |  |  |  | $ 939 | 5,735 |
Customer Relationships [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |
Customer Relationships [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  |  |  |  |  |  |  |  |  |  | 16 years |  |
Other Intangible Assets [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |
Developed Technology Rights [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |
Developed Technology Rights [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  |  |  |  |  |  |  |  |  |  | 20 years |  |
Noncompete Agreements [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |
Noncompete Agreements [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |
Piazza Rosa Group [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired, Total |  | $ 10,056 |  |  |  | $ 10,100 |  |  |  | 12,673 |  |  |  |
Other Payments to Acquire Businesses |  |  |  |  |  | 2,800 |  |  |  | 2,617 |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total |  | 4,087 |  |  |  | 4,087 |  |  |  | 4,086 |  | $ 4,086 |  |
Goodwill, Purchase Accounting Adjustments |  |  |  |  |  |  |  |  |  | 416 |  |  |  |
Business Combination, Contingent Consideration, Liability, Total |  |  |  |  |  |  |  |  |  | 1,000 |  | 1,000 |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles |  |  |  |  |  |  |  |  |  | (1) |  |  |  |
Goodwill, Ending Balance |  | 6,218 |  |  |  | 6,218 |  |  |  | 6,634 |  | 6,634 |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Property, Plant, and Equipment |  |  |  |  |  |  |  |  |  | 558 |  |  |  |
Piazza Rosa Group [Member] | Scenario, Forecast [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill, Purchase Accounting Adjustments |  |  |  |  | $ 1,800 |  |  |  |  |  |  |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles |  |  |  |  | $ (1,500) |  |  |  |  |  |  |  |  |
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 |  |  |  | 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 |  |  |  | $ 2,300 |  |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  |  |  |  | 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 |  |  |  | $ 200 |  |  |  |  |  |  |  |
Standex Electronics Japan Corporation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired, Total |  |  | $ 129,155 |  |  |  |  | $ 129,200 |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total |  |  | 51,400 |  |  |  |  | 51,400 |  |  |  |  |  |
Goodwill, Purchase Accounting Adjustments |  |  |  |  |  |  | 3,400 |  |  |  |  |  |  |
Goodwill, Ending Balance |  |  | $ 79,434 |  |  |  |  | $ 79,434 |  | 79,400 |  | 79,400 |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  | 100.00% |  |  |  |  | 100.00% |  |  |  |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Pension |  |  |  |  |  |  | 1,900 |  |  |  |  |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Property, Plant, and Equipment |  |  |  |  |  |  | (200) |  |  |  |  |  |  |
Standex Electronics Japan Corporation [Member] | Investor Banker Fees [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Acquisition Related Costs |  |  |  |  |  |  |  |  |  |  |  |  | 2,700 |
Standex Electronics Japan Corporation [Member] | Third Party Due Diligence Expenses [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Acquisition Related Costs |  |  |  |  |  |  |  |  |  |  |  |  | 3,000 |
Standex Electronics Japan Corporation [Member] | Acquisition-related Costs [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Acquisition Related Costs |  |  |  |  |  |  |  |  |  |  |  | 200 |  |
Standex Electronics Japan Corporation [Member] | Fair Value Adjustment to Intangible Assets [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of Intangible Assets, Total |  |  |  |  |  |  |  |  |  |  |  |  | 1,800 |
Standex Electronics Japan Corporation [Member] | Fair Value Adjustment to Fixed Assets [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation, Total |  |  |  |  |  |  |  |  |  |  |  |  | 900 |
Standex Electronics Japan Corporation [Member] | Fair Value Adjustment to Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest Expense, Total |  |  |  |  |  |  |  |  |  |  |  |  | 800 |
Standex Electronics Japan Corporation [Member] | Fair Value Adjustment to Acquisition Related Costs [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Acquisition Related Costs |  |  |  |  |  |  |  |  |  |  |  |  | 4,200 |
Standex Electronics Japan Corporation [Member] | Customer Relationships [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  |  |  |  |  |  | 15 years |  |  |  |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles |  |  |  |  |  |  | (200) |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  | $ 3,400 |  |  |  |  | $ 3,400 |  |  |  |  |  |
Standex Electronics Japan Corporation [Member] | Developed Technology Rights [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles |  |  |  |  |  |  | (2,300) |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  | 47,800 |  |  |  |  | $ 47,800 |  |  |  |  |  |
Standex Electronics Japan Corporation [Member] | Developed Technology Rights [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |
Standex Electronics Japan Corporation [Member] | Developed Technology Rights [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  |  |  |  |  |  | 20 years |  |  |  |  |  |
Standex Electronics Japan Corporation [Member] | Order or Production Backlog [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles |  |  |  |  |  |  | $ 100 |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  | $ 200 |  |  |  |  | $ 200 |  |  |  |  |  |
Horizon Scientific Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired, Total |  |  |  |  |  |  |  |  | $ 25,001 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total |  |  |  |  |  |  |  |  | 16,150 |  |  |  |  |
Business Combination, Contingent Consideration, Liability, Total |  |  |  |  |  |  |  |  | 8,000 |  |  |  |  |
Goodwill, Ending Balance |  |  |  |  |  |  |  |  | $ 6,660 |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |
Payments for Previous Acquisition |  |  |  |  |  |  |  |  |  |  |  | 300 |  |
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 |  |  |  |  |  |  |  |  |  |  |  | $ 2,800 | $ 2,100 |
Horizon Scientific Inc. [Member] | Customer Relationships [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  |  |  |  |  |  |  | 15 years |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  |  |  |  |  |  |  | $ 14,500 |  |  |  |  |
Horizon Scientific Inc. [Member] | Order or Production Backlog [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  |  |  |  |  |  |  | 300 |  |  |  |  |
Horizon Scientific Inc. [Member] | Trademarks [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets |  |  |  |  |  |  |  |  | $ 1,400 |  |  |  |  |
Wisconsin-based Northlake Engineering, Inc [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired, Total |  |  |  | $ 13,700 |  |  |  |  |  |  | 13,700 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total |  |  |  | 6,800 |  |  |  |  |  |  | 6,824 |  |  | 6,824
Goodwill, Ending Balance |  |  |  | $ 5,100 |  |  |  |  |  |  | $ 5,121 |  |  | $ 5,121
Business Acquisition, Percentage of Voting Interests Acquired |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |
Wisconsin-based Northlake Engineering, Inc [Member] | Customer Relationships [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total |  |  |  | $ 4,100 |  |  |  |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  |  | 12 years 182 days |  |  |  |  |  |  |  |  |  |
Wisconsin-based Northlake Engineering, Inc [Member] | Trademarks [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total |  |  |  | $ 2,400 |  |  |  |  |  |  |  |  |  |
Wisconsin-based Northlake Engineering, Inc [Member] | Noncompete Agreements [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  |  | $ 300 |  |  |  |  |  |  |  |  |  |
[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.

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- 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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- 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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- 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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- Definition This element represents the amount of any measurement period adjustment (as defined) realized during the reporting period to pensions assumed in connection with a business combination for which the initial accounting was incomplete. + References No definition available. + Details
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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) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e1043-128460 + Details
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- Definition Amount of liability recognized arising from contingent consideration in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 35 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6911338&loc=d3e6819-128478 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476 + Details
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- Definition This element represents the amount of any measurement period adjustment (as defined) realized during the reporting period to intangibles acquired in connection with a business combination for which the initial accounting was incomplete. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 4A -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=SL65897772-128472 + Details
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- Definition This element represents the amount of any measurement period adjustment (as defined) realized during the reporting period to property, plant, and equipment acquired in connection with a business combination for which the initial accounting was incomplete. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 4A -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=SL65897772-128472 + Details
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- 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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- Definition Amount of intangible assets, excluding goodwill, acquired at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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- Definition The amount of identifiable intangible assets recognized as of the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=108330185&loc=d3e2207-128464 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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