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Note 2 - Significant Accounting Policies (Details Textual)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Depreciation   $ 23,127 $ 21,465 $ 16,742
Goodwill and Intangible Asset Impairment [1]   0 0 $ 40,687
Goodwill, Impairment Loss $ 4,611      
Financial Assumptions Including Sales Growth, Terminal Growth Rate       3.00%
Financial Assumptions Including Sales Growth, Discount Rate       15.70%
Amortization of Financing Costs and Debt Discount Premium   3,516 3,939 $ 5,429
Deferred Costs Amortization Expense, Next Twelve Months   4,798    
Deferred Costs Amortization Expense, Year Two   4,982    
Deferred Costs Amortization Expense, Year Three   4,936    
Deferred Costs Amortization Expense, Year Four   4,931    
Deferred Costs Amortization Expense, Year Five   5,099    
Advertising Expense   45,926 45,488 39,258
Research and Development Expense   42,925 $ 37,229 32,922
Fair Value, Inputs, Level 2 [Member]        
Debt Instrument, Fair Value Disclosure   903,500    
Term Loan [Member]        
Long-term Debt   $ 902,959    
Trade Names [Member]        
Finite-Lived Intangible Asset, Useful Life 2 years      
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) $ 36,076     $ (36,076)
Accounts Receivable [Member] | Customer Concentration Risk [Member]        
Concentration Risk, Percentage   7.00% 9.00%  
Number of Major Customers   1 1  
Sales Revenue, Net [Member] | Customer Concentration Risk [Member]        
Concentration Risk, Percentage   6.00% 7.00% 7.00%
Number of Major Customers   0 0 0
[1] Represents the 2015 impairment of certain tradenames due to a change in brand strategy to transition and consolidate various brands to the Generac tradename ($36,076) and the impairment of goodwill related to the Ottomotores reporting unit ($4,611).