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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

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