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Statements of Consolidated Income (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Income Statement [Abstract]        
Net sales $ 87,869 $ 99,981 $ 173,659 $ 189,906
Cost of products sold 61,425 68,784 122,455 131,261
GROSS PROFIT 26,444 31,197 51,204 58,645
Costs and expenses        
Selling 7,752 9,061 14,960 17,566
General and administrative 9,391 10,836 19,577 21,994
Research and engineering 3,864 4,183 7,585 7,958
Other operating (income) expense - net 252 (495) 3,983 (698)
Total costs and expenses 21,259 23,585 46,105 46,820
OPERATING INCOME 5,185 7,612 5,099 11,825
Other income (expense)        
Interest income 112 98 214 207
Interest expense (149) (202) (282) (363)
Other income (expense) - net (682) 98 (625) 74
Total other income (expense) (719) (6) (693) (82)
INCOME BEFORE INCOME TAXES 4,466 7,606 4,406 11,743
Income taxes 786 2,526 982 3,925
NET INCOME $ 3,680 $ 5,080 $ 3,424 $ 7,818
BASIC EARNINGS PER SHARE        
Net income $ 0.68 $ 0.94 $ 0.63 $ 1.45
DILUTED EARNINGS PER SHARE        
Net income 0.68 0.94 0.63 1.44
Cash dividends declared per share $ 0.20 $ 0.20 $ 0.40 $ 0.40
Weighted-average number of shares outstanding - basic 5,392 5,389 5,394 5,390
Weighted-average number of shares outstanding - diluted 5,393 5,393 5,396 5,430