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Note 8 - Reconciliation of Product Warranty Liability (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Balance at beginning of period $ 28,185 $ 32,171 $ 30,909 $ 33,734
Product warranty reserve assumed in acquisition 351 193 351 193
Payments (5,812) (5,672) (16,345) (16,696)
Provision for warranties issued 6,033 5,595 15,062 17,623
Changes in estimates for pre-existing warranties 105 182 (1,115) (2,385)
Balance at end of period 28,862 32,469 28,862 32,469
Balance at beginning of period 27,241 $ 25,679 27,193 $ 23,092
Deferred revenue on extended warranty contracts assumed in acquisition 291 291
Deferred revenue on extended warranty contracts sold 1,694 $ 1,315 3,884 $ 5,329
Amortization of deferred revenue on extended warranty contracts (1,138) (850) (3,280) (2,277)
Balance at end of period $ 28,088 $ 26,144 $ 28,088 $ 26,144