Note 2 - Acquisitions (Details Textual) - USD ($) $ in Thousands | 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. | |