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STATEMENTS OF CONSOLIDATED INCOME (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Income Statement [Abstract]        
Net sales $ 111,716 $ 111,940 $ 210,405 $ 220,786
Cost of products sold 74,167 74,974 141,557 147,808
GROSS PROFIT 37,549 36,966 68,848 72,978
Costs and expenses        
Selling 9,291 9,506 18,352 18,402
General and administrative 12,127 12,149 23,607 24,156
Research and engineering 3,571 3,747 7,341 7,402
Other operating expense 2,071 1,890 2,192 1,239
Total costs and expenses 27,060 27,292 51,492 51,199
OPERATING INCOME 10,489 9,674 17,356 21,779
Other income (expense)        
Interest income 134 179 250 316
Interest expense (105) (149) (208) (345)
Other income 162 209 199 354
Total other income (expense) 191 239 241 325
INCOME BEFORE INCOME TAXES 10,680 9,913 17,597 22,104
Income taxes 4,294 3,317 6,246 7,375
NET INCOME $ 6,386 $ 6,596 $ 11,351 $ 14,729
BASIC EARNINGS PER SHARE        
Net income $ 1.19 $ 1.24 $ 2.11 $ 2.76
DILUTED EARNINGS PER SHARE        
Net income $ 1.17 $ 1.21 $ 2.08 $ 2.71
Cash dividends declared per share $ 0.20 $ 0.20 $ 0.20 $ 0.40
Weighted-average number of shares outstanding-basic 5,368 5,332 5,372 5,333
Weighted-average number of shares outstanding-diluted 5,450 5,441 5,450 5,440