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Note 20 - Valuation and Qualifying Accounts (Tables) | 12 Months Ended
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Dec. 31, 2021
Notes Tables |
Valuation and Qualifying Accounts [Table Text Block] |
|  | Balance at Beginning of Year |  |  | Additions Charged to Earnings |  |  | Additions Charged to Retained Earnings (1) |  |  | Charges to Reserve, Net (2) |  |  | Reserves Established for Acquisitions |  |  | Balance at End of Year |
Year ended December 31, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for credit losses |  | $ | 12,001 |  |  | $ | 206 |  |  | $ | - |  |  | $ | (1,640 | ) |  | $ | 1,458 |  |  | $ | 12,025 |
Reserves for inventory |  |  | 27,817 |  |  |  | 17,698 |  |  |  | - |  |  |  | (15,749 | ) |  |  | 3,771 |  |  |  | 33,537 |
Valuation of deferred tax assets |  |  | 5,740 |  |  |  | 1,404 |  |  |  | - |  |  |  | (2,441 | ) |  |  | 3,171 |  |  |  | 7,874 |
Year ended December 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for credit losses |  | $ | 6,968 |  |  | $ | 4,645 |  |  | $ | 1,147 |  |  | $ | (957 | ) |  | $ | 198 |  |  | $ | 12,001 |
Reserves for inventory |  |  | 24,293 |  |  |  | 11,353 |  |  |  | - |  |  |  | (8,788 | ) |  |  | 959 |  |  |  | 27,817 |
Valuation of deferred tax assets |  |  | 5,024 |  |  |  | 716 |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 5,740 |
Year ended December 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for credit losses |  | $ | 4,873 |  |  | $ | 3,086 |  |  | $ | - |  |  | $ | (1,033 | ) |  | $ | 42 |  |  | $ | 6,968 |
Reserves for inventory |  |  | 23,140 |  |  |  | 4,821 |  |  |  | - |  |  |  | (3,867 | ) |  |  | 199 |  |  |  | 24,293 |
Valuation of deferred tax assets |  |  | 5,802 |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | (778 | ) |  |  | 5,024 |

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- Definition A tabular disclosure of allowance and reserve accounts including their beginning and ending balances, as well as a reconciliation by type of activity during the period. Alternatively, disclosure of the required information may be within the footnotes to the financial statements or a supplemental schedule to the financial statements. + References No definition available. + Details
Name: | gnrc_ValuationAndQualifyingAccountsTableTextBlock
Namespace Prefix: | gnrc_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_TableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration