XML 18 R31.htm IDEA: XBRL DOCUMENT v2.4.0.6
Share-based Compensation (Details 1) (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Stock option activities of company    
Options outstanding beginning of period 144,019  
Number of Options Granted     
Issuance of common stock upon exercise of stock options, for cash, shares     
Number of Options Forfeited, cancelled or expired (6,259)  
Options outstanding end of the period 137,760 144,019
Options exercisable, end of period, Number of Options 123,408  
Options vested and expected to vest, Number of Options 136,208  
Weighted Average exercise Price, Options Outstanding, Beginning of period $ 18.28  
Weighted average exercise price, Granted $ 0.00  
Weighted average exercise price, Exercised $ 0.00  
Weighted average exercise price, Forfeited, cancelled or expired $ 16.53  
Weighted Average exercise Price, Options Outstanding, end of period $ 18.36 $ 18.28
Weighted average exercise price, Options exercisable, end of period $ 18.82  
Weighted Average exercise Price, Options vested and expected to vest, end of period $ 18.39  
Weighted Average Remaining Contractual Term (in years) Options Outstanding 4 years 10 months 21 days 4 years 10 months 28 days
Options exercisable at March 31, 2013, Weighted Average Remaining Contractual Term (in years) 4 years 7 months 13 days  
Options vested and expected to vest, Weighted Average Remaining Contractual Term (in years) 4 years 10 months 17 days