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Stock Plans - Stock Option Activity (Details) (USD$) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Number of shares outstanding - roll forward    
Outstanding 100,000 116,636
Granted under 2011 Incentive Stock Plan 8,760 91,240
Forfeited 0 0
Exercised under 1999 Obnibus Stock Plan 25,396  
Exercisable 18,248 34,520
Weighted average exercise price - roll forward    
Granted $ 11.31  
Forfeited $ 0  
Exercised $ 3.11  
Outstanding $ 10.99 $ 9.25
Exercisable $ 10.96  
Weighted average remaining contractural terms    
Outstanding 8 years 263 days 7 years 285 days
Exercisable 8 years 245 days  
Aggregate Intrinsic Value    
Outstanding $ 165,934 $ 326,492
Exercisable $ 30,839