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Note 2 - Acquisitions (Details Textual) - USD ($) $ in Thousands |  | 1 Months Ended |  |
--- | --- | --- | --- | ---
Oct. 07, 2020 | Sep. 30, 2020 | Mar. 31, 2021 | Dec. 31, 2020
Goodwill, Ending Balance |  |  | $ 849,294 | $ 855,228
Acquisition of Enbala [Member] |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired, Total | $ 41,982 |  |  |
Business Acquisition, Purchase Price Allocation, Intangible Assets Including Goodwill | 46,645 |  |  |
Goodwill, Ending Balance | $ 27,345 |  |  |
Other 2020 Acquisitions [Member] |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired, Total |  | $ 22,815 |  |

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- Definition The amount of acquisition cost of a business combination allocated to an identifiable intangible asset including goodwill. + References No definition available. + Details
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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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- Definition The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3213-108585 + Details
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