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Note 9 - Product Warranty Obligations - Reconciliation of Product Warranty Liability (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Balance at beginning of period $ 31,695 $ 30,197 $ 30,909
Product warranty reserve assumed in acquisition 43 840 351
Payments (18,861) (18,691) (21,686)
Provision for warranty issued 21,347 19,148 20,823
Changes in estimates for pre-existing warranties 1,198 201 (200)
Balance at end of period 35,422 31,695 30,197
Balance at beginning of period 31,080 28,961 27,193
Deferred revenue contracts assumed in acquisition 291
Deferred revenue contracts issued (1) [1] 27,107 7,733 5,978
Amortization of deferred revenue contracts (7,246) (5,614) (4,501)
Balance at end of period $ 50,941 $ 31,080 $ 28,961
[1] The increase in deferred revenue contracts issued during 2017 was largely due to the launch of a post-sale extended warranty program.