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Statements of Consolidated Income (Unaudited) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Statements of Consolidated Income [Abstract]        
Net sales $ 114,206 $ 108,690 $ 334,992 $ 318,308
Cost of products sold 75,699 71,130 223,507 211,651
GROSS PROFIT 38,507 37,560 111,485 106,657
Costs and expenses        
Selling 9,344 9,485 27,746 26,793
General and administrative 12,788 12,297 36,944 35,039
Research and engineering 3,893 3,239 11,295 9,816
Other operating (income) expense (677) 2,459 562 1,671
Total costs and expenses 25,348 27,480 76,547 73,319
OPERATING INCOME 13,159 10,080 34,938 33,338
Other income (expense)        
Interest income 160 131 476 422
Interest expense (144) (177) (489) (654)
Other income 235 194 589 421
Total other income (expense) 251 148 576 189
INCOME BEFORE INCOME TAXES 13,410 10,228 35,514 33,527
Income taxes 4,126 3,568 11,501 11,483
NET INCOME $ 9,284 $ 6,660 $ 24,013 $ 22,044
BASIC EARNINGS PER SHARE        
Net income attributable to PLPC common shareholders $ 1.75 $ 1.27 $ 4.51 $ 4.19
DILUTED EARNINGS PER SHARE        
Net income attributable to PLPC common shareholders $ 1.71 $ 1.24 $ 4.42 $ 4.09
Cash dividends declared per share $ 0.20 $ 0.20 $ 0.60 $ 0.60
Weighted-average number of shares outstanding - basic 5,319 5,253 5,328 5,263
Weighted-average number of shares outstanding - diluted 5,431 5,381 5,432 5,386