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Note 9 - Reconciliation of Product Warranty Liability (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Balance at beginning of year $ 30,909 $ 33,734 $ 36,111
Product warranty reserve assumed in acquisition 351 360 600
Payments (21,686) (20,975) (19,084)
Provision for warranties issued 20,823 22,890 33,707
Changes in estimates for pre-existing warranties (200) (5,100) (17,600)
Balance at end of year 30,197 30,909 33,734
Balance at beginning of year 27,193 $ 23,092 $ 13,474
Deferred revenue contracts assumed in acquisition 291
Deferred revenue contracts sold 5,978 $ 7,343 $ 11,998
Amortization of deferred revenue contracts (4,501) (3,242) (2,380)
Balance at end of year $ 28,961 $ 27,193 $ 23,092