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Note 2 - Acquisitions (Details Textual) - USD ($) $ in Thousands |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended | 15 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Aug. 31, 2018 | Dec. 31, 2018 | Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2018 | Dec. 31, 2018 | Jun. 30, 2018
Payments to Acquire Businesses, Net of Cash Acquired, Total |  |  |  |  |  |  |  |  | $ 95,918 | $ 10,397 |  |  |
Goodwill, Ending Balance |  |  |  |  | $ 261,569 |  |  |  | 261,569 |  |  | $ 261,569 | $ 211,751
Business Combination, Contingent Consideration, Liability, Total | [1] |  |  |  | 5,036 |  |  |  | 5,036 |  |  | 5,036 | 7,535
Agile Magnetics [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired, Total |  | $ 39,193 |  |  | 39,193 |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total |  | 13,718 |  |  | 18,150 | $ 13,718 |  |  | 18,150 |  | $ 13,718 | 18,150 |
Goodwill, Ending Balance |  | 20,142 |  |  | 15,791 | 20,142 |  |  | 15,791 |  | 20,142 | 15,791 |
Agile Magnetics [Member] | Customer Relationships [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total |  |  |  |  | 14,300 |  |  |  | 14,300 |  |  | 14,300 |
Agile Magnetics [Member] | Trademarks [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total |  |  |  |  | 3,800 |  |  |  | 3,800 |  |  | 3,800 |
Tenibac-Graphion, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired, Total |  | 56,726 |  | $ 57,300 | 56,726 |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total |  | 15,960 |  | 16,900 | 16,860 | 15,960 |  |  | 16,860 |  | 15,960 | 16,860 |
Goodwill, Ending Balance |  | 32,949 |  | 33,700 | 33,748 | 32,949 |  |  | 33,748 |  | 32,949 | 33,748 |
Tenibac-Graphion, Inc. [Member] | Customer Relationships [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total |  |  |  | $ 11,300 |  |  |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  |  | 9 years |  |  |  |  |  |  |  |  |
Tenibac-Graphion, Inc. [Member] | Trademarks [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total |  |  |  | $ 4,200 |  |  |  |  |  |  |  |  |
Tenibac-Graphion, Inc. [Member] | Other Intangible Assets [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total |  |  |  | $ 1,400 |  |  |  |  |  |  |  |  |
Piazza Rosa Group [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired, Total |  |  | $ 10,056 |  |  | 900 |  | $ 10,100 |  |  |  | 12,673 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total |  |  | 4,087 |  | 3,472 |  |  | 4,087 | 3,472 |  |  | 3,472 |
Goodwill, Ending Balance |  | $ 7,100 | 6,218 |  | 7,076 | $ 7,100 |  | 6,218 | 7,076 |  | 7,100 | 7,076 |
Other Payments to Acquire Businesses |  |  |  |  |  |  |  | 2,800 |  |  | $ 2,600 | $ 2,617 |
Business Combination, Contingent Consideration, Liability, Total |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000
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 |  |  |  |  |
Horizon Scientific Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Deferred Compensation Due on Second Anniversary |  |  | 3,000 |  |  |  |  | 3,000 |  |  |  |  |
Business Combination, Deferred Compensation Due on Third Anniversary |  |  | $ 5,600 |  |  |  |  | $ 5,600 |  |  |  |  |
Business Combination, Deferred Compensation Arrangements |  |  |  |  | $ 700 |  | $ 700 |  | $ 700 | $ 700 |  |  |
[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 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 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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