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Note 7 - Product Warranty Obligations (Details) - Reconciliation of Product Warranty Liability (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Reconciliation of Product Warranty Liability [Abstract]        
Balance at beginning of period $ 32,171 $ 40,156 $ 33,734 $ 36,112
Product warranty reserve assumed in acquisition 193   193  
Payments (5,672) (4,571) (16,696) (14,167)
Provision for warranties issued 5,595 7,607 17,623 27,947
Changes in estimates for pre-existing warranties 182 (5,600) (2,385) (12,300)
Balance at end of period 32,469 37,592 32,469 37,592
Balance at beginning of period 25,679 16,729 23,092 13,473
Deferred revenue on extended warranty contracts sold 1,315 4,138 5,329 8,544
Amortization of deferred revenue on extended warranty contracts (850) (600) (2,277) (1,750)
Balance at end of period $ 26,144 $ 20,267 $ 26,144 $ 20,267