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Shareholders' Equity (Stock Option Activity) (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Shareholders' Equity [Abstract]      
Options, Beginning balance 257,425 305,825 240,700
Options, Granted 240,000   137,500
Options, Exercised (82,338) (45,400) (70,375)
Options, Forfeited (2,000) (3,000) (2,000)
Options, Ending balance 413,087 257,425 305,825
Options, Exercisable 107,587    
Weighted average exercise price, Granted $ 15.28   $ 18.82
Weighted average exercise price, Exercised $ 3.35 $ 3.62 $ 3.68
Weighted average exercise price, Forfeited $ 15.28 $ 16.32 $ 3.82
Weighted average grant date fair value, Granted $ 6.54   $ 8.69
Weighted average grant date fair value, Exercised $ 1.81 $ 1.75 $ 1.81
Weighted average grant date fair value, Forfeited $ 6.54 $ 7.54 $ 1.81