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Note 8 - Product Warranty Obligations - Reconciliation of Product Warranty Liability (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Balance at beginning of period $ 30,735 $ 28,185 $ 30,197 $ 30,909
Product warranty reserve assumed in acquisition 351 840 351
Payments (5,424) (5,812) (13,976) (16,345)
Provision for warranties issued 5,762 6,033 13,464 15,062
Changes in estimates for pre-existing warranties 286 105 834 (1,115)
Balance at end of period 31,359 28,862 31,359 28,862
Balance at beginning of period 29,082 27,241 28,961 27,193
Deferred revenue on extended warranty contracts assumed in acquisition 291 291
Deferred revenue on extended warranty contracts sold 2,843 1,694 5,606 3,884
Amortization of deferred revenue on extended warranty contracts (1,430) (1,138) (4,072) (3,280)
Balance at end of period $ 30,495 $ 28,088 $ 30,495 $ 28,088