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Note 2 - Acquisitions (Details Textual) - USD ($) $ in Thousands |  |  | 3 Months Ended | 9 Months Ended | 20 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Apr. 26, 2019 | Mar. 12, 2019 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Dec. 31, 2019
Payments to Acquire Businesses, Net of Cash Acquired, Total |  |  |  | $ 22,815 | $ 120,863 |  |
Goodwill, Ending Balance |  |  |  | $ 815,624 |  | $ 815,624 | $ 805,284
Pika [Member] |  |  |  |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired, Total | $ 49,068 |  |  |  |  |  |
Business Acquisition, Purchase Price Allocation, Intangible Assets Including Goodwill | 58,196 |  |  |  |  |  |
Goodwill, Ending Balance | $ 19,896 |  |  |  |  |  |
Neurio [Member] |  |  |  |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired, Total |  | $ 59,071 | $ 7,922 |  |  |  |
Business Acquisition, Purchase Price Allocation, Intangible Assets Including Goodwill |  | 58,762 |  |  |  |  |
Goodwill, Ending Balance |  | $ 17,862 |  |  |  |  |
Captiva, Energy Systems, and Mean Green Acquisitions [Member] |  |  |  |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired, Total |  |  |  |  |  | $ 24,070 |

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(10)(1)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=120320667&loc=SL49117168-202975 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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