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Statements of Consolidated Income (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Income Statement [Abstract]        
Net sales $ 89,046 $ 102,100 $ 262,705 $ 292,006
Cost of products sold 62,887 69,645 185,342 200,906
GROSS PROFIT 26,159 32,455 77,363 91,100
Costs and expenses        
Selling 7,893 9,444 22,852 27,010
General and administrative 8,010 10,153 27,596 32,147
Research and engineering 3,745 4,399 11,320 12,357
Other operating expense - net 4,425 3,324 8,410 2,626
Total costs and expenses 24,073 27,320 70,178 74,140
OPERATING INCOME 2,086 5,135 7,185 16,960
Other income (expense)        
Interest income 103 138 317 345
Interest expense (141) (141) (423) (504)
Other income - net 93 162 (531) 236
Total other income (expense) 55 159 (637) 77
INCOME BEFORE INCOME TAXES 2,141 5,294 6,548 17,037
Income taxes 1,935 2,739 2,918 6,664
NET INCOME $ 206 $ 2,555 $ 3,630 $ 10,373
BASIC EARNINGS PER SHARE        
Net income $ 0.04 $ 0.48 $ 0.67 $ 1.93
DILUTED EARNINGS PER SHARE        
Net income 0.04 0.48 0.67 1.92
Cash dividends declared per share $ 0.20 $ 0.20 $ 0.60 $ 0.60
Weighted-average number of shares outstanding - basic 5,356 5,372 5,381 5,384
Weighted-average number of shares outstanding - diluted 5,372 5,376 5,397 5,389