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Statements of Consolidated Operations (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Income Statement [Abstract]    
Net sales $ 78,682 $ 85,790
Cost of products sold 54,393 61,030
GROSS PROFIT 24,289 24,760
Costs and expenses    
Selling 7,631 7,207
General and administrative 10,086 10,186
Research and engineering 3,738 3,721
Other operating (income) expense - net (853) 3,731
Total costs and expenses 20,602 24,845
OPERATING INCOME (LOSS) 3,687 (85)
Other income (expense)    
Interest income 75 102
Interest expense (158) (133)
Other income - net 52 57
Total other income (expense) (31) 26
INCOME (LOSS) BEFORE INCOME TAXES 3,656 (59)
Income taxes 998 197
NET INCOME (LOSS) $ 2,658 $ (256)
BASIC EARNINGS (LOSS) PER SHARE    
Net income (loss) $ 0.51 $ (0.05)
DILUTED EARNINGS (LOSS) PER SHARE    
Net income (loss) 0.51 (0.05)
Cash dividends declared per share $ 0.20 $ 0.20
Weighted-average number of shares outstanding - basic 5,211 5,396
Weighted-average number of shares outstanding - diluted 5,229 5,396