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Note 2 - Acquisitions (Details Textual) - USD ($) $ in Thousands |  |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Sep. 30, 2017 | Jun. 30, 2017 | Jun. 30, 2018
Payments to Acquire Businesses, Net of Cash Acquired |  |  |  |  | $ 10,397 |  |  |  |  |  |  |
Goodwill |  | $ 248,557 | $ 242,690 |  | 248,557 | $ 242,690 |  |  |  | $ 248,557 | $ 242,690 |
Business Combination, Acquisition Related Costs |  |  |  |  | 302 |  |  |  |  |  |  |
Amortization of Intangible Assets |  |  |  |  | 2,200 |  |  |  | 900 |  |  |
Interest Expense |  |  |  |  | 1,721 |  |  |  | 697 |  |  |
Business Combination, Contingent Consideration, Liability | [1] | 2,810 | 2,108 |  | 2,810 | 2,108 |  |  |  | 2,810 | 2,108 |
Business Combination, Deferred Compensation Arrangements |  |  |  |  | 703 |  |  |  |  |  |  |
Piazza Rosa Group [Member] |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired |  | 10,056 |  |  | 10,100 |  |  |  |  |  |  |
Other Payments to Acquire Businesses |  | 2,833 |  |  | 2,800 |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  | 4,087 |  |  | 4,087 |  |  |  |  | 4,087 |  |
Goodwill |  | 6,218 |  |  | 6,218 |  |  |  |  | 6,218 |  |
Piazza Rosa Group [Member] | Trademarks (Indefinite-Lived) [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  | 1,600 |  |  | 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 |  | 2,300 |  |  | $ 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 |  | 200 |  |  | $ 200 |  |  |  |  | 200 |  |
Standex Electronics Japan Corporation [Member] |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired |  |  |  | $ 129,155 |  |  | $ 129,200 |  |  |  | 129,155 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  |  | 51,400 | 53,800 |  | 51,400 | 53,800 |  |  |  | 51,400 |
Goodwill |  | $ 77,600 | 77,631 | $ 75,985 | 77,600 | 77,631 | $ 75,985 |  |  | 77,600 | 77,631 |
Business Acquisition, Percentage of Voting Interests Acquired |  |  |  | 100.00% |  |  | 100.00% |  |  |  |  |
Goodwill, Purchase Accounting Adjustments |  |  |  |  |  | 1,646 |  |  |  | $ 1,600 |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles |  |  |  |  |  | (2,400) |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  | 700 |  |  |
Standex Electronics Japan Corporation [Member] | Fair Value Adjustment to Fixed Assets [Member] |  |  |  |  |  |  |  |  |  |  |  |
Depreciation |  |  |  |  |  |  |  |  | 300 |  |  |
Standex Electronics Japan Corporation [Member] | Fair Value Adjustment to Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |
Interest Expense |  |  |  |  |  |  |  |  | $ 400 |  |  |
Standex Electronics Japan Corporation [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 |  |  |  | $ 3,600 |  |  | $ 3,600 |  |  |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles |  |  |  |  |  | (200) |  |  |  |  |  |
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 |  |  |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles |  |  |  |  |  | (2,300) |  |  |  |  |  |
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, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  |  | $ 100 |  |  | $ 100 |  |  |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles |  |  |  |  |  | 100 |  |  |  |  |  |
Horizon Scientific Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired |  |  | 25,001 |  |  |  |  | $ 24,700 |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  |  | 16,150 |  |  | 16,150 |  | $ 16,200 |  |  | 16,150 |
Goodwill |  |  | $ 6,660 |  |  | $ 6,660 |  |  |  |  | $ 6,660 |
Business Acquisition, Percentage of Voting Interests Acquired |  |  |  |  |  |  |  | 100.00% |  |  |  |
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 |  |  |  |  |  |  |
Horizon Scientific Inc. [Member] | Scenario, Forecast [Member] |  |  |  |  |  |  |  |  |  |  |  |
Payments for Previous Acquisition |  |  |  |  |  |  |  |  |  |  |  | $ 300
Horizon Scientific Inc. [Member] | Customer Relationships [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  |  |  |  |  |  |  | $ 14,500 |  |  |  |
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 |  |  |  |
Horizon Scientific Inc. [Member] | Trademarks [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  |  |  |  |  |  |  | $ 1,400 |  |  |  |
[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 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=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://www.xbrl.org/2003/role/presentationRef -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 intangible assets, excluding goodwill, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=84160947&loc=d3e2207-128464 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 + Details
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- Definition Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the 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 -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e961-128460 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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