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Statements of Consolidated Income (Unaudited) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Statements of Consolidated Income [Abstract]        
Net sales $ 111,940 $ 114,530 $ 220,786 $ 209,618
Cost of products sold 74,974 77,824 147,808 140,521
GROSS PROFIT 36,966 36,706 72,978 69,097
Costs and expenses        
Selling 9,506 9,272 18,402 17,308
General and administrative 12,149 11,780 24,156 22,742
Research and engineering 3,747 3,215 7,402 6,577
Other operating (income) expenses 1,890 (694) 1,239 (788)
Total costs and expenses 27,292 23,573 51,199 45,839
OPERATING INCOME 9,674 13,133 21,779 23,258
Other income (expense)        
Interest income 179 140 316 291
Interest expense (149) (266) (345) (477)
Other income 209 43 354 227
Total other income (expense) 239 (83) 325 41
INCOME BEFORE INCOME TAXES 9,913 13,050 22,104 23,299
Income taxes 3,317 4,520 7,375 7,915
NET INCOME 6,596 8,530 14,729 15,384
Net loss attributable to noncontrolling interest, net of tax 0 144 0 0
NET INCOME ATTRIBUTABLE TO PLPC $ 6,596 $ 8,386 $ 14,729 $ 15,384
BASIC EARNINGS PER SHARE        
Net income attributable to PLPC common shareholders $ 1.24 $ 1.59 $ 2.76 $ 2.92
DILUTED EARNINGS PER SHARE        
Net income attributable to PLPC common shareholders $ 1.21 $ 1.55 $ 2.71 $ 2.85
Cash dividends declared per share $ 0.20 $ 0.20 $ 0.40 $ 0.40
Weighted-average number of shares outstanding - basic 5,332 5,263 5,333 5,268
Weighted-average number of shares outstanding - diluted 5,441 5,393 5,440 5,390