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Statements of Consolidated Income (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Income Statement [Abstract]    
Net sales $ 98,139 $ 84,569
Cost of products sold 66,621 59,904
GROSS PROFIT 31,518 24,665
Costs and expenses    
Selling 8,861 8,284
General and administrative 10,916 10,329
Research and engineering 3,661 3,690
Other operating expense - net 335 104
Total costs and expenses 23,773 22,407
OPERATING INCOME 7,745 2,258
Other income (expense)    
Interest income 95 104
Interest expense (280) (299)
Other income - net 69 55
Total other income (expense) (116) (140)
INCOME BEFORE INCOME TAXES 7,629 2,118
Income taxes 2,101 600
NET INCOME $ 5,528 $ 1,518
BASIC EARNINGS PER SHARE    
Net income $ 1.10 $ 0.30
DILUTED EARNINGS PER SHARE    
Net income 1.09 0.30
Cash dividends declared per share $ 0.20 $ 0.20
Weighted-average number of shares outstanding - basic 5,046 5,118
Weighted-average number of shares outstanding - diluted 5,064 5,130