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Note 7 - Product Warranty Obligations (Tables)
3 Months Ended
Mar. 31, 2015
Product Warranties Disclosures [Abstract]  
Schedule of Product Warranty Liability [Table Text Block]
   

Three Months Ended

March 31,

 
   

2015

   

2014

 
                 

Balance at beginning of period

  $ 30,909     $ 33,734  

Payments

    (5,433 )     (6,723 )

Provision for warranties issued

    4,549       6,039  

Changes in estimates for pre-existing warranties

    (748 )     (1,143 )

Balance at end of period

  $ 29,277     $ 31,907  
   

Three Months Ended

March 31,

 
   

2015

   

2014

 
                 

Balance at beginning of period

  $ 27,193     $ 23,092  

Deferred revenue on extended warranty contracts sold

    1,380       2,219  

Amortization of deferred revenue on extended warranty contracts

    (1,042 )     (679 )

Balance at end of period

  $ 27,531     $ 24,632  
Product Warranty Obligations Included in Consolidated Balance Sheet [Table Text Block]
   

March 31,

   

December 31,

 
   

2015

   

2014

 

Product warranty liability

               

Current portion - other accrued liabilities

  $ 22,893     $ 24,143  

Long-term portion - other long-term liabilities

    6,384       6,766  

Total

  $ 29,277     $ 30,909  
                 

Deferred revenue related to extended warranty

               

Current portion - other accrued liabilities

  $ 4,857     $ 4,519  

Long-term portion - other long-term liabilities

    22,674       22,674  

Total

  $ 27,531     $ 27,193