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Statements of Consolidated Income (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Income Statement [Abstract]    
Net sales $ 97,153 $ 98,139
Cost of products sold 69,888 66,621
GROSS PROFIT 27,265 31,518
Costs and expenses    
Selling 8,413 8,861
General and administrative 12,318 10,916
Research and engineering 4,140 3,661
Other operating expense - net 348 335
Total costs and expenses 25,219 23,773
OPERATING INCOME 2,046 7,745
Other income (expense)    
Interest income 179 95
Interest expense (368) (280)
Other income - net 71 69
Total other income (expense) (118) (116)
INCOME BEFORE INCOME TAXES 1,928 7,629
Income tax expense 104 2,101
NET INCOME $ 1,824 $ 5,528
BASIC EARNINGS PER SHARE    
Net income $ 0.36 $ 1.10
DILUTED EARNINGS PER SHARE    
Net income $ 0.36 $ 1.09
Weighted-average number of shares outstanding - basic 5,045 5,046
Weighted-average number of shares outstanding - diluted 5,054 5,064