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Note 18 - Valuation and Qualifying Accounts (Tables) | 12 Months Ended
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Dec. 31, 2016
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, 201 6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 2,494 |  |  | $ | 1,654 |  |  | $ | (1,110 | ) |  | $ | 2,604 |  |  | $ | 5,642 |
Reserves for inventory |  |  | 10,582 |  |  |  | 5,359 |  |  |  | (5,357 | ) |  |  | 2,447 |  |  |  | 13,031 |
Valuation of deferred tax assets |  |  | 1,523 |  |  |  | 638 |  |  |  | – |  |  |  | 2,201 |  |  |  | 4,362 |
Year ended December 31, 201 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 2,275 |  |  | $ | 481 |  |  | $ | (325 | ) |  | $ | 63 |  |  | $ | 2,494 |
Reserves for inventory |  |  | 9,387 |  |  |  | 3,739 |  |  |  | (3,158 | ) |  |  | 614 |  |  |  | 10,582 |
Valuation of deferred tax assets |  |  | 1,385 |  |  |  | 138 |  |  |  | – |  |  |  | – |  |  |  | 1,523 |
Year ended December 31, 201 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 2,658 |  |  | $ | 672 |  |  | $ | (1,264 | ) |  | $ | 209 |  |  | $ | 2,275 |
Reserves for inventory |  |  | 6,558 |  |  |  | 2,797 |  |  |  | (2,250 | ) |  |  | 2,282 |  |  |  | 9,387 |
Valuation of deferred tax assets |  |  | 1,021 |  |  |  | 364 |  |  |  | – |  |  |  | – |  |  |  | 1,385 |

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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: | xbrli:stringItemType
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