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Note 2 - Revenue Recognition - Contract Liabilities (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
Deferred revenue - January 1, 2018 $ 871
Acquired in Dielectrics business combination 2,175
Increases due to consideration received from customers 4,188
Revenue recognized (4,727)
Deferred revenue - December 31, 2018 $ 2,507