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Note 11 - Warranty Accrual (Tables)
 12 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Product Warranty Liability [Table Text Block]
   
Year Ended December 31,
 
 
 
2016
 
 
2015
 
 
2014
 
 
 
(Dollars in thousands)
 
Balance at beginning of period
 
$
15,328
 
 
$
18,346
 
 
$
22,238
 
Expense provisions
 
 
8,905
 
 
 
6,303
 
 
 
4,834
 
Cash payments
 
 
(11,017
)
 
 
(9,510
)
 
 
(6,126
)
Adjustments
 
 
7,462
 
 
 
189
 
 
 
(2,600
)
Balance at end of period
 
$
20,678
 
 
$
15,328
 
 
$
18,346