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Note 19 - Acquisition - Pro Forma Information (Unaudited) (Details) - Dielectrics [Member]
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
$ / shares
Sales $ 193,510
Operating Income 19,464
Net Income $ 14,110
Basic (in dollars per share) | $ / shares $ 1.92
Diluted (in dollars per share) | $ / shares $ 1.90