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Note 11 - Warranty Accrual (Tables)
 3 Months Ended
Mar. 31, 2017
Notes Tables  
Schedule of Product Warranty Liability [Table Text Block]
   
Three Months Ended
 
 
 
March 31,
 
 
 
2017
 
 
2016
 
 
 
(Dollars in thousands)
 
Balance at beginning of period
 
$
20,678
 
 
$
15,328
 
Expense provisions
 
 
2,407
 
 
 
1,452
 
Cash payments
 
 
(2,365
)
 
 
(2,915
)
Adjustments
 
 
50
 
 
 
2,987
 
Balance at end of period
 
$
20,770
 
 
$
16,852