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Note 1 - Description of Business and Basis of Presentation - Impact of Adopting Accounting Standards (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Accounts receivable, less allowance for doubtful accounts $ 262,170 $ 220,547 $ 279,294
Inventories 439,745 396,990 387,049
Other accrued liabilities 122,546 97,457 112,618
Deferred income taxes 49,140 24,422 41,852
Other long-term liabilities 83,634 67,677 82,893
Retained earnings 636,814 464,908 610,835
Net sales 397,634 330,485  
Costs of goods sold 257,645 221,685  
Selling and service 42,682 39,467  
Research and development 11,853 10,287  
Other, net 1,383 (83)  
Provision for income taxes 11,416 7,823  
Net income attributable to Generac Holdings Inc. $ 33,645 $ 12,175  
Net income attributable to Generac Holdings Inc. per common share - basic: (in dollars per share) $ 0.42 $ 0.21  
Net income attributable to Generac Holdings Inc. per common share - diluted: (in dollars per share) $ 0.42 $ 0.20  
Comprehensive income attributable to Generac Holdings Inc. $ 44,703 $ 15,720  
Net income 33,770 12,182  
Deferred income taxes 4,283 6,530  
Accounts receivable 18,744 20,368  
Inventories (48,798) (35,675)  
Other accrued liabilities 11,065 103  
Net cash used in operating activities 28,968 (5,175)  
Proceeds from beneficial interests in securitization transactions 867 629  
Net cash provided by (used in) investing activities (5,997) (1,274)  
Accounts Receivable 262,170 220,547 279,294
Inventories 439,745 396,990 387,049
Other accrued liabilities 122,546 97,457 112,618
Deferred income taxes 49,140 24,422 41,852
Other long-term liabilities 83,634 67,677 82,893
Retained earnings $ 636,814 464,908 610,835
Previously Reported [Member]      
Accounts receivable, less allowance for doubtful accounts   223,031 280,002
Inventories   390,908 380,341
Other accrued liabilities   91,853 105,067
Deferred income taxes   27,376 43,789
Other long-term liabilities   62,129 76,995
Retained earnings   469,508 616,347
Net sales   331,814  
Costs of goods sold   221,328  
Selling and service   40,184  
Research and development   10,301  
Other, net   (223)  
Provision for income taxes   8,251  
Net income attributable to Generac Holdings Inc.   $ 12,842  
Net income attributable to Generac Holdings Inc. per common share - basic: (in dollars per share)   $ 0.22  
Net income attributable to Generac Holdings Inc. per common share - diluted: (in dollars per share)   $ 0.21  
Comprehensive income attributable to Generac Holdings Inc.   $ 16,387  
Net income   12,849  
Deferred income taxes   6,958  
Accounts receivable   19,973  
Inventories   (35,338)  
Other accrued liabilities   (305)  
Net cash used in operating activities   (4,546)  
Proceeds from beneficial interests in securitization transactions    
Net cash provided by (used in) investing activities   (1,903)  
Accounts Receivable   223,031 280,002
Inventories   390,908 380,341
Other accrued liabilities   91,853 105,067
Deferred income taxes   27,376 43,789
Other long-term liabilities   62,129 76,995
Retained earnings   469,508 616,347
Restatement Adjustment [Member] | Accounting Standards Update 2014-09 [Member]      
Accounts receivable, less allowance for doubtful accounts   (2,484) (708)
Inventories   6,082 6,708
Other accrued liabilities   5,604 7,551
Deferred income taxes   (2,954) (1,937)
Other long-term liabilities   5,548 5,898
Retained earnings   (4,600) (5,513)
Net sales   (1,329)  
Costs of goods sold   357  
Selling and service   (717)  
Research and development   (14)  
Other, net   140  
Provision for income taxes   (428)  
Net income attributable to Generac Holdings Inc.   $ (667)  
Net income attributable to Generac Holdings Inc. per common share - basic: (in dollars per share)   $ (0.01)  
Net income attributable to Generac Holdings Inc. per common share - diluted: (in dollars per share)   $ (0.01)  
Comprehensive income attributable to Generac Holdings Inc.   $ (667)  
Net income   (667)  
Deferred income taxes   (428)  
Accounts receivable   395  
Inventories   (337)  
Other accrued liabilities   408  
Net cash used in operating activities   (629)  
Proceeds from beneficial interests in securitization transactions   629  
Net cash provided by (used in) investing activities   629  
Accounts Receivable   (2,484) (708)
Inventories   6,082 6,708
Other accrued liabilities   5,604 7,551
Deferred income taxes   (2,954) (1,937)
Other long-term liabilities   5,548 5,898
Retained earnings   $ (4,600) $ (5,513)