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Note 2 - Acquisitions (Details Textual) - USD ($) $ in Thousands |  |  | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2017 | Mar. 31, 2017 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Mar. 31, 2017 | Mar. 31, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2017 | Mar. 31, 2018 | Jun. 30, 2017 | Dec. 31, 2016
Payments to Acquire Businesses, Net of Cash Acquired, Total |  |  |  |  |  |  |  | $ 10,397 |  | $ 153,815 |  |  |
Goodwill, Ending Balance |  |  | $ 254,703 |  |  |  | $ 254,703 | 254,703 |  |  | $ 254,703 | $ 242,690 |
Business Combination, Acquisition Related Costs |  |  | 1,254 |  |  | $ 5,422 |  | 2,962 |  | 6,925 |  |  |
Amortization of Intangible Assets, Total |  |  | 2,200 |  |  | 1,100 |  | 6,700 |  | 3,100 |  |  |
Interest Expense, Total |  |  | 2,286 |  |  | 953 |  | 5,800 |  | 2,499 |  |  |
Piazza Rosa Group [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired, Total | $ 10,056 |  |  |  | $ 10,100 |  | 10,056 |  |  |  |  |  |
Other Payments to Acquire Businesses | 2,833 |  |  |  | 2,800 |  | 2,833 |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total | 4,087 |  | 4,086 |  | 4,087 |  | 4,086 | 4,086 |  |  | 4,086 |  |
Goodwill, Purchase Accounting Adjustments |  |  |  | $ 1,643 |  |  | 1,600 |  |  |  |  |  |
Goodwill, Ending Balance | 6,218 |  | 4,575 |  | 6,218 |  | 4,575 | 4,575 |  |  | 4,575 |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles |  |  |  | $ 1 |  |  |  |  |  |  |  |  |
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 |  | 129,155 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total |  | 53,800 | 51,400 |  |  | 53,800 | 51,400 | 51,400 |  | 53,800 | 51,400 |  |
Goodwill, Purchase Accounting Adjustments |  |  |  |  |  |  |  |  | $ 3,449 |  | 3,400 |  |
Goodwill, Ending Balance |  | $ 75,985 | 79,434 |  |  | $ 75,985 | 79,434 | 79,434 |  | $ 75,985 | 79,434 |  |
Business Acquisition, Percentage of Voting Interests Acquired |  | 100.00% |  |  |  | 100.00% |  |  |  | 100.00% |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Pension |  |  |  |  |  |  |  |  |  |  | 1,900 |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles |  |  |  |  |  |  |  |  | (2,400) |  |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Property, Plant, and Equipment |  |  |  |  |  |  |  |  | $ 5,503 |  | (200) |  |
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 |  |  |  |  |  | $ 600 |  |  |  | $ 1,800 |  |  |
Standex Electronics Japan Corporation [Member] | Fair Value Adjustment to Fixed Assets [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation, Total |  |  |  |  |  | 400 |  |  |  | 1,100 |  |  |
Standex Electronics Japan Corporation [Member] | Fair Value Adjustment to Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Acquisition Related Costs |  |  |  |  |  | 3,100 |  |  |  | 3,600 |  |  |
Interest Expense, Total |  |  |  |  |  | $ 300 |  |  |  | $ 800 |  |  |
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 |  |  | 3,400 |  |  |  | 3,400 | $ 3,400 |  |  | 3,400 |  |
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 |  |  | 47,800 |  |  |  | 47,800 | $ 47,800 |  |  | 47,800 |  |
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 |  |  | 200 |  |  |  | $ 200 | $ 200 |  |  | 200 |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles |  |  |  |  |  |  |  |  |  |  | $ 100 |  |
Horizon Scientific Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  | $ 2,100 |  |  |  |  |

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