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Statements of Consolidated Operations (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Income Statement [Abstract]        
Net sales $ 83,220 $ 87,869 $ 161,903 $ 173,659
Cost of products sold 56,414 61,425 110,807 122,455
GROSS PROFIT 26,806 26,444 51,096 51,204
Costs and expenses        
Selling 8,183 7,752 15,814 14,960
General and administrative 10,962 9,391 21,049 19,577
Research and engineering 3,609 3,864 7,347 7,585
Other operating (income) expense - net (27) 252 (880) 3,983
Total costs and expenses 22,727 21,259 43,330 46,105
OPERATING INCOME 4,079 5,185 7,766 5,099
Other income (expense)        
Interest income 68 112 143 214
Interest expense (166) (149) (324) (282)
Other expense - net (208) (682) (156) (625)
Total other income (expense) (306) (719) (337) (693)
INCOME BEFORE INCOME TAXES 3,773 4,466 7,429 4,406
Income taxes 1,018 786 2,016 982
NET INCOME $ 2,755 $ 3,680 $ 5,413 $ 3,424
BASIC EARNINGS PER SHARE        
Net income $ 0.53 $ 0.68 $ 1.04 $ 0.63
DILUTED EARNINGS PER SHARE        
Net income 0.53 0.68 1.04 0.63
Cash dividends declared per share $ 0.20 $ 0.20 $ 0.40 $ 0.40
Weighted-average number of shares outstanding - basic 5,186 5,392 5,198 5,394
Weighted-average number of shares outstanding - diluted 5,208 5,393 5,218 5,396