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Note 12 - Warranty Accrual (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Product Warranty Liability [Table Text Block]
   
Year Ended December 31,
  
   
2018
    
2017
    
2016
  
   
(Dollars in thousands)
  
Balance at beginning of period
   $
21,909
     $
20,678
     $
15,328
  
Expense provisions
    
14,513
      
10,769
      
8,905
  
Cash payments
    
(11,573
 )    
(10,879
 )    
(11,017
 )
Adjustments
    
3,413
      
1,341
      
7,462
  
Balance at end of period
   $
28,262
     $
21,909
     $
20,678