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Statements of Consolidated Income (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Income Statement [Abstract]        
Net sales $ 99,239 $ 88,299 $ 281,320 $ 250,202
Cost of products sold 65,704 59,444 193,446 170,252
GROSS PROFIT 33,535 28,855 87,874 79,950
Costs and expenses        
Selling 8,957 8,022 25,867 23,836
General and administrative 11,042 10,579 32,143 31,628
Research and engineering 3,520 3,433 10,821 10,778
Other operating (income) expense - net 206 196 681 (683)
Total costs and expenses 23,725 22,230 69,512 65,559
OPERATING INCOME 9,810 6,625 18,362 14,391
Other income (expense)        
Interest income 62 63 325 206
Interest expense (255) (264) (831) (588)
Other income (expense) - net 122 110 259 (46)
Total other income (expense) (71) (91) (247) (428)
INCOME BEFORE INCOME TAXES 9,739 6,534 18,115 13,963
Income taxes 3,461 1,792 6,163 3,809
NET INCOME $ 6,278 $ 4,742 $ 11,952 $ 10,154
BASIC EARNINGS PER SHARE        
Net income $ 1.23 $ 0.92 $ 2.34 $ 1.96
DILUTED EARNINGS PER SHARE        
Net income 1.23 0.92 2.33 1.95
Cash dividends declared per share $ 0.20 $ 0.20 $ 0.60 $ 0.60
Weighted-average number of shares outstanding - basic 5,104 5,146 5,113 5,180
Weighted-average number of shares outstanding - diluted 5,120 5,169 5,129 5,200