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Statements of Consolidated Income (Unaudited) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Statements of Consolidated Income [Abstract]    
Net sales $ 98,689 $ 108,846
Cost of products sold 67,390 72,834
GROSS PROFIT 31,299 36,012
Costs and expenses    
Selling 9,061 8,896
General and administrative 11,480 12,007
Research and engineering 3,770 3,655
Other operating (income) expense 121 (651)
Total costs and expenses 24,432 23,907
OPERATING INCOME 6,867 12,105
Other income (expense)    
Interest income 116 137
Interest expense (103) (196)
Other income 37 145
Total other income (expense) 50 86
INCOME BEFORE INCOME TAXES 6,917 12,191
Income taxes 1,952 4,058
NET INCOME $ 4,965 $ 8,133
BASIC EARNINGS PER SHARE    
Net income $ 0.92 $ 1.52
DILUTED EARNINGS PER SHARE    
Net income $ 0.91 $ 1.50
Cash dividends declared per share $ 0 $ 0.20
Weighted-average number of shares outstanding - basic 5,377 5,334
Weighted-average number of shares outstanding - diluted 5,457 5,438