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Note 2 - Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2016
Notes Tables |
Property Plant and Equipment, Estimated Useful Lives [Table Text Block] |
Land improvements |  |  | 15 | – | 20 |
Buildings and improvements |  |  | 10 | – | 40 |
Machinery and equipment |  |  | 3 | – | 10 |
Dies and tools |  |  | 3 | – | 10 |
Vehicles |  |  | 3 | – | 6 |
Office equipment and systems |  |  | 3 | – | 15 |
Leasehold improvements |  |  | 2 | – | 20 |

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- Definition Tabular disclosure for the useful life of long-lived, physical assets used in the normal conduct of business and not intended for resale. + 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