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Note 2 - Acquisitions (Details Textual) - USD ($) $ in Thousands |  |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Apr. 26, 2019 | Mar. 12, 2019 | Jun. 01, 2018 | Sep. 30, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Payments to Acquire Businesses, Net of Cash Acquired, Total |  |  |  |  | $ 120,863 | $ 71,926 |
Goodwill, Ending Balance |  |  |  | $ 811,914 | 811,914 |  | $ 764,655
Pika [Member] |  |  |  |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired, Total | $ 49,068 |  |  |  |  |  |
Business Acquisition, Purchase Price Allocation, Intangible Assets Including Goodwill | 55,986 |  |  |  |  |  |
Goodwill, Ending Balance | $ 23,286 |  |  |  |  |  |
Neurio [Member] |  |  |  |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired, Total |  | $ 59,071 |  |  |  |  |
Business Acquisition, Purchase Price Allocation, Intangible Assets Including Goodwill |  | 58,511 |  |  |  |  |
Goodwill, Ending Balance |  | 24,011 |  |  |  |  |
Business Combination, Liabilities Arising from Contingencies, Amount Recognized |  | $ 7,922 |  |  |  |  |
Selmec [Member] |  |  |  |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired, Total |  |  | $ 79,972 |  |  |  |
Business Acquisition, Purchase Price Allocation, Intangible Assets Including Goodwill |  |  | 79,826 |  |  |  |
Goodwill, Ending Balance |  |  | 46,196 |  |  |  |
Business Combination, Liabilities Arising from Contingencies, Amount Recognized |  |  | $ 14,902 |  |  |  |
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual |  |  |  | $ 4,814 | $ 32,018 |  |

X
- 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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Namespace Prefix: | gnrc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount, measured at acquisition-date fair value, of all liabilities assumed that arise from contingencies and were recognized by the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=116869197&loc=d3e4845-128472 + Details
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X
- Definition This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + 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://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=77989000&loc=SL49117168-202975 Reference 2: 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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X
- 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=118932676&loc=d3e3213-108585 + Details
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- Details
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- Details
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- Details
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