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Statements of Consolidated Income - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Statement [Abstract]      
Net sales $ 354,666 $ 388,185 $ 409,776
Cost of products sold 251,214 267,237 278,875
GROSS PROFIT 103,452 120,948 130,901
Costs and expenses      
Selling 30,593 35,655 35,704
General and administrative 36,878 42,563 44,557
Research and engineering 14,879 16,302 14,708
Other operating expenses - net 8,753 5,190 3,922
Goodwill impairment 0 0 862
Total costs and expenses 91,103 99,710 99,753
OPERATING INCOME 12,349 21,238 31,148
Other income (expense)      
Interest income 391 483 618
Interest expense (565) (658) (450)
Other income (expense) (469) 347 478
Total other income (expense) (643) 172 646
INCOME BEFORE INCOME TAXES 11,706 21,410 31,794
Income taxes 5,031 8,549 11,207
NET INCOME $ 6,675 $ 12,861 $ 20,587
BASIC EARNINGS PER SHARE      
Net income $ 1.25 $ 2.39 $ 3.84
DILUTED EARNINGS PER SHARE      
Net income 1.24 2.39 3.77
Cash dividends declared per share $ 0.80 $ 0.80 $ 0.60
Weighted-average number of shares outstanding - basic 5,350 5,377 5,361
Weighted-average number of shares outstanding - diluted 5,366 5,382 5,467