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Statements of Consolidated Income (Unaudited) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Statements of Consolidated Income [Abstract]    
Net sales $ 108,846 $ 95,088
Cost of products sold 72,834 62,697
GROSS PROFIT 36,012 32,391
Costs and expenses    
Selling 8,896 8,036
General and administrative 12,007 10,962
Research and engineering 3,655 3,362
Other operating (income) expense (651) (94)
Total costs and expenses 23,907 22,266
OPERATING INCOME 12,105 10,125
Other income (expense)    
Interest income 137 151
Interest expense (196) (211)
Other income 145 184
Total other income (expense) 86 124
INCOME BEFORE INCOME TAXES 12,191 10,249
Income taxes 4,058 3,395
NET INCOME 8,133 6,854
Net loss attributable to noncontrolling interest, net of tax   (144)
NET INCOME ATTRIBUTABLE TO PLPC $ 8,133 $ 6,998
BASIC EARNINGS PER SHARE    
Net income attributable to PLPC common shareholders $ 1.52 $ 1.33
DILUTED EARNINGS PER SHARE    
Net income attributable to PLPC common shareholders $ 1.50 $ 1.30
Cash dividends declared per share $ 0.20 $ 0.20
Weighted-average number of shares outstanding--basic 5,334 5,272
Weighted-average number of shares outstanding-diluted 5,438 5,400