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Note 11 - Warranty Accrual (Tables)
3 Months Ended
Mar. 31, 2020
Notes Tables  
Schedule of Product Warranty Liability [Table Text Block]
   

Three Months Ended

 
   

March 31,

 
   

2020

   

2019

 
   

(Dollars in thousands)

 

Balance at beginning of period

  $ 31,386     $ 28,262  

Expense provisions

    3,165       3,348  

Cash payments

    (3,664 )     (2,493 )

Adjustments

    -       875  

Balance at end of period

  $ 30,887     $ 29,992