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Note 13 - Acquisition - Pro Forma Information (Unaudited) (Details) - Dielectrics [Member] - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2018
Sales $ 47,808 $ 142,813
Operating income 5,885 13,970
Net income $ 4,134 $ 9,700
Basic (in dollars per share) $ 0.56 $ 1.32
Diluted (in dollars per share) $ 0.56 $ 1.31