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Note 8 - Product Warranty Obligations (Tables)
 3 Months Ended
Mar. 31, 2017
Notes Tables  
Schedule of Product Warranty Liability [Table Text Block]
   
Three Months Ended March 31,
  
   
2017
    
2016
  
Balance at beginning of period
   $
31,695
     $
30,197
  
Product warranty reserve assumed in acquisition
    
43
      
840
  
Payments
    
(4,560
 )    
(3,652
 )
Provision for warranty issued
    
4,160
      
3,482
  
Changes in estimates for pre-existing warranties
    
670
      
1,037
  
Balance at end of period
   $
32,008
     $
31,904
  
   
Three Months Ended March 31,
  
   
2017
    
2016
  
Balance at beginning of period
   $
31,080
     $
28,961
  
Deferred revenue contracts issued
    
1,969
      
1,144
  
Amortization of deferred revenue contracts
    
(1,598
 )    
(1,275
 )
Balance at end of period
   $
31,451
     $
28,830
  
Product Warranty Obligations Included In Consolidated Balance Sheet [Table Text Block]
   
March 31,
   
December 31,
  
   
2017
    
2016
  
Product warranty liability
                
Current portion - other accrued liabilities
   $
20,232
     $
20,763
  
Long-term portion - other long-term liabilities
    
11,776
      
10,932
  
Total
   $
32,008
     $
31,695
  
                 
Deferred revenue related to extended warranties
                
Current portion - other accrued liabilities
   $
6,983
     $
6,728
  
Long-term portion - other long-term liabilities
    
24,468
      
24,352
  
Total
   $
31,451
     $
31,080