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Note 2 - Acquisitions (Details Textual) - USD ($) $ in Thousands |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2019 | Sep. 30, 2018 | Aug. 31, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2019
Goodwill, Ending Balance | $ 281,503 |  |  | $ 281,149 |  | $ 281,149 | $ 281,149
Payments to Acquire Businesses, Net of Cash Acquired, Total |  |  |  | (0) | $ 96,828 |  |
GS Engineering [Member] |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross | 30,502 |  |  | 30,502 |  | 30,500 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total | 8,910 |  |  | 8,910 |  | 8,910 | 8,910
Goodwill, Ending Balance | 17,976 |  |  | 18,123 |  | 18,123 | 18,123
Payments to Acquire Businesses, Net of Cash Acquired, Total | $ 29,880 |  |  | 29,880 |  |  |
GS Engineering [Member] | Developed Technology Rights [Member] |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total |  |  |  | 5,600 |  | $ 5,600 | 5,600
Finite-Lived Intangible Asset, Useful Life |  |  |  |  |  | 15 years |
GS Engineering [Member] | Trademarks [Member] |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total |  |  |  | 900 |  | $ 900 | 900
GS Engineering [Member] | Customer Relationships [Member] |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total |  |  |  | 2,400 |  | $ 2,400 | 2,400
Finite-Lived Intangible Asset, Useful Life |  |  |  |  |  | 13 years |
Agile Magnetics [Member] |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross |  | $ 39,194 |  |  |  |  | 39,194
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total |  | 13,718 |  | 17,350 | 13,718 | $ 17,350 | 17,350
Goodwill, Ending Balance |  | 20,142 |  | 16,434 | 20,142 | 16,434 | 16,434
Payments to Acquire Businesses, Net of Cash Acquired, Total |  | 39,193 |  |  | $ 39,200 |  | 39,193
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
Agile Magnetics [Member] | Customer Relationships [Member] |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total |  |  |  | 13,500 |  | 13,500 | 13,500
Finite-Lived Intangible Asset, Useful Life |  |  |  |  | 13 years |  |
Agile Magnetics [Member] | Noncompete Agreements [Member] |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total |  |  |  | 100 |  | 100 | 100
Finite-Lived Intangible Asset, Useful Life |  |  |  |  | 5 years |  |
Tenibac-Graphion, Inc. [Member] |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross |  | 57,284 |  |  |  |  | 57,284
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total |  | 15,960 |  | 16,860 | $ 15,960 | 16,860 | 16,860
Goodwill, Ending Balance |  | 32,949 |  | 34,360 | $ 32,949 | 34,360 | 34,360
Payments to Acquire Businesses, Net of Cash Acquired, Total |  | $ 56,726 | $ 57,300 |  |  |  | 56,726
Business Acquisition, Goodwill, Expected Tax Deductible Amount |  |  |  | 34,400 |  | 34,400 | 34,400
Tenibac-Graphion, Inc. [Member] | Trademarks [Member] |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total |  |  |  | 4,200 |  | 4,200 | 4,200
Tenibac-Graphion, Inc. [Member] | Customer Relationships [Member] |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total |  |  |  | 11,300 |  | 11,300 | 11,300
Finite-Lived Intangible Asset, Useful Life |  |  | 15 years |  |  |  |
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 |  | 1,400 | 1,400
Finite-Lived Intangible Asset, Useful Life |  |  | 5 years |  |  |  |
Horizon Scientific Inc. [Member] |  |  |  |  |  |  |
Business Combination, Deferred Compensation Due on Second Anniversary |  |  |  | 2,800 |  | 2,800 | 2,800
Business Combination, Deferred Compensation Due on Third Anniversary |  |  |  | 5,600 |  | $ 5,600 | $ 5,600
Business Combination, Deferred Compensation Arrangements |  |  |  | $ 700 |  |  |

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