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Note 8 - Product Warranty Obligations (Tables)
 6 Months Ended
Jun. 30, 2017
Notes Tables  
Schedule of Product Warranty Liability [Table Text Block]
   
Three Months Ended June 30,
    
Six Months Ended June 30,
  
   
2017
    
2016
    
2017
    
2016
  
Balance at beginning of period
   $
32,008
     $
31,904
     $
31,695
     $
30,197
  
Product warranty reserve assumed in acquisition
    
-
      
-
      
43
      
840
  
Payments
    
(4,285
 )    
(4,900
 )    
(8,845
 )    
(8,552
 )
Provision for warranty issued
    
4,086
      
4,220
      
8,246
      
7,702
  
Changes in estimates for pre-existing warranties
    
1,004
      
(489
 )    
1,674
      
548
  
Balance at end of period
   $
32,813
     $
30,735
     $
32,813
     $
30,735
  
   
Three Months Ended June 30,
    
Six Months Ended June 30,
  
   
2017
    
2016
    
2017
    
2016
  
Balance at beginning of period
   $
31,451
     $
28,830
     $
31,080
     $
28,961
  
Deferred revenue contracts issued
    
6,898
      
1,619
      
8,867
      
2,763
  
Amortization of deferred revenue contracts
    
(1,632
 )    
(1,367
 )    
(3,230
 )    
(2,642
 )
Balance at end of period
   $
36,717
     $
29,082
     $
36,717
     $
29,082
  
Product Warranty Obligations Included In Consolidated Balance Sheet [Table Text Block]
   
June 30,
2017
    
December 31,
2016
  
Product warranty liability
                
Current portion - other accrued liabilities
   $
20,582
     $
20,763
  
Long-term portion - other long-term liabilities
    
12,231
      
10,932
  
Total
   $
32,813
     $
31,695
  
                 
Deferred revenue related to extended warranties
                
Current portion - other accrued liabilities
   $
7,635
     $
6,728
  
Long-term portion - other long-term liabilities
    
29,082
      
24,352
  
Total
   $
36,717
     $
31,080