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Note 13 - Acquisition - Pro Forma Information (Unaudited) (Details) - Dielectrics [Member] - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Sales $ 45,986 $ 47,428
Operating Income 3,489 4,368
Net Income $ 2,375 $ 2,681
Basic (in dollars per share) $ 0.33 $ 0.37
Diluted (in dollars per share) $ 0.32 $ 0.37