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Note 19 - Valuation and Qualifying Accounts (Tables) | 12 Months Ended
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Dec. 31, 2025
Notes Tables |
Valuation and Qualifying Accounts [Table Text Block] |
|  | Balance at Beginning of Year |  |  | Additions Charged to Earnings |  |  | Charges to Reserve, Net (1) |  |  | Reserves Established for Acquisitions |  |  | Balance at End of Year |
Year ended December 31, 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for credit losses |  | $ | 35,465 |  |  | $ | 1,398 |  |  | $ | (2,359 | ) |  | $ | - |  |  | $ | 34,504 |
Reserves for inventory |  |  | 48,173 |  |  |  | 23,375 |  |  |  | (2,282 | ) |  |  | - |  |  |  | 69,266 |
Valuation of deferred tax assets |  |  | 5,225 |  |  |  | 1,822 |  |  |  | (509 | ) |  |  | - |  |  |  | 6,538 |
Year ended December 31, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for credit losses |  | $ | 33,925 |  |  | $ | 4,524 |  |  | $ | (3,509 | ) |  | $ | 525 |  |  | $ | 35,465 |
Reserves for inventory |  |  | 39,027 |  |  |  | 10,738 |  |  |  | (2,924 | ) |  |  | 1,332 |  |  |  | 48,173 |
Valuation of deferred tax assets |  |  | 5,136 |  |  |  | 447 |  |  |  | (358 | ) |  |  | - |  |  |  | 5,225 |
Year ended December 31, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for credit losses |  | $ | 27,664 |  |  | $ | 7,443 |  |  | $ | (1,206 | ) |  | $ | 24 |  |  | $ | 33,925 |
Reserves for inventory |  |  | 39,714 |  |  |  | 4,621 |  |  |  | (5,308 | ) |  |  | - |  |  |  | 39,027 |
Valuation of deferred tax assets |  |  | 4,638 |  |  |  | 516 |  |  |  | (18 | ) |  |  | - |  |  |  | 5,136 |

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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
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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