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Stock-Based Compensation (Details) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Stock options          
Number of shares of common stock authorized for issuance 442,750   442,750    
Excess tax benefit from exercise of stock option $ 0 $ 0 $ 0 $ 0  
Total of Company's APIC pool 111,000   111,000   111,000
Proceeds from the exercise of stock     63,492 11,250  
Stock Options
         
Stock options          
Outstanding options (in shares) 14,751   14,751   21,362
Common stock reserved for future grants (in shares) 115,573   115,573    
Compensation cost recognized 3,800 4,500 6,400 9,000  
Unrecognized compensation cost 27,000   27,000    
Period during which compensation cost is expected to be recognized     3 years    
Proceeds from the exercise of stock     $ 63,000 $ 11,000  
Stock Options | Minimum
         
Stock options          
Option price range(as a percent)     85.00%    
Period over which options become exercisable     1 year    
Stock Options | Maximum
         
Stock options          
Option price range(as a percent)     110.00%    
Expiration period of options granted     7 years    
Period over which options become exercisable     3 years