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Statements of Consolidated Income (Unaudited) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Income Statement [Abstract]        
Net sales $ 102,100 $ 100,828 $ 292,006 $ 311,233
Cost of products sold 69,645 69,168 200,906 210,725
GROSS PROFIT 32,455 31,660 91,100 100,508
Costs and expenses        
Selling 9,444 8,874 27,010 27,226
General and administrative 10,153 10,386 32,147 33,993
Research and engineering 4,399 3,714 12,357 11,055
Other operating (income) expense - net 3,324 419 2,626 2,611
Total costs and expenses 27,320 23,393 74,140 74,885
OPERATING INCOME 5,135 8,267 16,960 25,623
Other income (expense)        
Interest income 138 204 345 454
Interest expense (141) (121) (504) (329)
Other income (expense) - net 162 194 236 393
Total other income (expense) 159 277 77 518
INCOME BEFORE INCOME TAXES 5,294 8,544 17,037 26,141
Income taxes 2,739 2,440 6,664 8,686
NET INCOME $ 2,555 $ 6,104 $ 10,373 $ 17,455
BASIC EARNINGS PER SHARE        
Net income $ 0.48 $ 1.14 $ 1.93 $ 3.25
DILUTED EARNINGS PER SHARE        
Net income $ 0.48 $ 1.12 $ 1.92 $ 3.20
Cash dividends declared per share $ 0.20 $ 0.20 $ 0.60 $ 0.40
Weighted-average number of shares outstanding - basic 5,372 5,361 5,384 5,369
Weighted-average number of shares outstanding - diluted 5,376 5,449 5,389 5,450