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Earnings and Dividends per Share (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
item
Sep. 30, 2011
Earnings and Dividends per Share        
Dilutive effect of outstanding stock option awards (in shares)   14,000   148,000
Number of quarters for which the dividends are declared and paid     3  
Dividends paid (in dollars per share)     $ 0.025  
Total dividends paid $ 211,000 $ 163,000 $ 629,000 $ 163,000