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