XML 19 R22.htm IDEA: XBRL DOCUMENT v2.4.0.6
Stock-based Compensation (Details) (USD $)
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Stock options      
Number of shares of common stock authorized for issuance 442,750    
Excess tax benefit from exercise of stock option $ 0 $ 0  
Total of Company's APIC pool 111,000   111,000
Proceeds from the exercise of stock 40,997 3,750  
Stock Options
     
Stock options      
Common stock reserved for additional grants (in shares) 119,323    
Compensation cost recognized 2,600 4,400  
Unrecognized compensation cost 13,000    
Period during which compensation cost is expected to be recognized 3 years    
Proceeds from the exercise of stock $ 41,000 $ 4,000  
Stock Options | Minimum
     
Stock options      
Option price range, minimum (as a percent) 85.00%    
Period over which options become exercisable 1 year    
Stock Options | Maximum
     
Stock options      
Option price range, minimum (as a percent) 110.00%    
Expiration period of options granted 7 years    
Period over which options become exercisable 3 years