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STATEMENTS OF CONSOLIDATED INCOME (UNAUDITED) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Income Statement [Abstract]    
Net sales $ 89,925 $ 98,689
Cost of products sold 62,477 67,390
GROSS PROFIT 27,448 31,299
Costs and expenses    
Selling 8,505 9,061
General and administrative 11,158 11,480
Research and engineering 3,775 3,770
Other operating (income) expense (203) 121
Total costs and expenses 23,235 24,432
OPERATING INCOME 4,213 6,867
Other income (expense)    
Interest income 109 116
Interest expense (161) (103)
Other income (expense) (24) 37
Total other income (expense) (76) 50
INCOME BEFORE INCOME TAXES 4,137 6,917
Income taxes 1,399 1,952
NET INCOME $ 2,738 $ 4,965
BASIC EARNINGS PER SHARE    
Net income $ 0.51 $ 0.92
DILUTED EARNINGS PER SHARE    
Net income $ 0.50 $ 0.91
Cash dividends declared per share $ 0.20 $ 0.00
Weighted-average number of shares outstanding - basic 5,392 5,377
Weighted-average number of shares outstanding - diluted 5,431 5,457