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Statements of Consolidated Income (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Income Statement [Abstract]        
Net sales $ 97,512 $ 83,220 $ 182,081 $ 161,903
Cost of products sold 67,839 56,414 127,743 110,807
GROSS PROFIT 29,673 26,806 54,338 51,096
Costs and expenses        
Selling 8,626 8,183 16,910 15,814
General and administrative 10,772 10,962 21,101 21,049
Research and engineering 3,612 3,609 7,301 7,347
Other operating (income) expense - net 369 (27) 474 (880)
Total costs and expenses 23,379 22,727 45,786 43,330
OPERATING INCOME 6,294 4,079 8,552 7,766
Other income (expense)        
Interest income 160 68 264 143
Interest expense (277) (166) (577) (324)
Other income - net 81 (208) 137 (156)
Total other income (expense) (36) (306) (176) (337)
INCOME BEFORE INCOME TAXES 6,258 3,773 8,376 7,429
Income taxes 2,102 1,018 2,702 2,016
NET INCOME $ 4,156 $ 2,755 $ 5,674 $ 5,413
BASIC EARNINGS PER SHARE        
Net income $ 0.81 $ 0.53 $ 1.11 $ 1.04
DILUTED EARNINGS PER SHARE        
Net income 0.81 0.53 1.11 1.04
Cash dividends declared per share $ 0.20 $ 0.20 $ 0.40 $ 0.40
Weighted-average number of shares outstanding - basic 5,116 5,186 5,117 5,198
Weighted-average number of shares outstanding - diluted 5,127 5,208 5,132 5,218