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Statements of Consolidated Income (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Income Statement [Abstract]    
Net sales $ 84,569 $ 78,682
Cost of products sold 59,904 54,393
GROSS PROFIT 24,665 24,289
Costs and expenses    
Selling 8,284 7,631
General and administrative 10,329 10,086
Research and engineering 3,690 3,738
Other operating (income) expense - net 104 (853)
Total costs and expenses 22,407 20,602
OPERATING INCOME 2,258 3,687
Other income (expense)    
Interest income 104 75
Interest expense (299) (158)
Other income - net 55 52
Total other income (expense) (140) (31)
INCOME BEFORE INCOME TAXES 2,118 3,656
Income taxes 600 998
NET INCOME $ 1,518 $ 2,658
BASIC EARNINGS PER SHARE    
Net income $ 0.30 $ 0.51
DILUTED EARNINGS PER SHARE    
Net income 0.30 0.51
Cash dividends declared per share $ 0.20 $ 0.20
Weighted-average number of shares outstanding - basic 5,118 5,211
Weighted-average number of shares outstanding - diluted 5,130 5,229